[ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] [ The terminals ] [ are ] [ in the same state. ] [ The switch and the bulb ] [ have to be ] [ in the same path ] [ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain any other components ] [ there ] [ is ] [ a gap ] [ in the circuit ] [ Bulb C ] [ is ] [ in a separate path ] [ Terminals 1 and 2 ] [ are connected ] [ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ there ] [ is ] [ an open path ] [ Terminal 4 and the positive terminal ] [ are not separated ] [ by the gap ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ Terminal 6 and the positive terminal ] [ are connected ] [ the battery ] [ is ] [ in an open path ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain ] [ any other components ] [ there ] [ is ] [ a gap ] [ in a circuit ] [ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ Bulb B ] [ is ] [ in a separate path ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] [ A and C ] [ are ] [ in different paths ] [ with the battery ] [ each bulb ] [ is ] [ in its own path ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Terminal 1 and the positive terminal ] [ are not connected ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] [ Terminal 5 and the positive terminal ] [ are connected ] [ Terminal 6 and the positive terminal ] [ are connected ] [ there ] [ is ] [ a short circuit ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ A non-zero voltage ] [ means ] [ that ] [ there ] [ is ] [ a gap ] [ The battery ] [ is contained ] [ in a closed path ] [ which ] [ does not contain ] [ any other components ] [ Terminals 1 and 4 ] [ are connected ] [ Terminals 1 and 4 ] [ are connected ] [ Terminal 5 and the positive terminal ] [ are not separated ] [ by the gap ] [ Measuring ] [ voltage ] [ indicates ] [ whether ] [ two terminals ] [ are separated ] [ by a gap. ] [ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ B and C ] [ are ] [ in the same path ] [ the terminals ] [ are not connected ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ A and C ] [ are not ] [ in the same path ] [ with the battery ] [ the battery ] [ is ] [ in an open path ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] [ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] [ Terminal 6 and the positive terminal ] [ are connected ] [ Terminal 6 and the positive terminal ] [ are connected ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ Terminal 6 and the positive terminal ] [ are connected ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ A and C ] [ are ] [ in different paths ] [ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Terminal 6 and the positive terminal ] [ are not separated ] [ by the gap ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ A and C ] [ are ] [ in different paths ] [ with the battery ] [ Terminal 4 and the positive terminal ] [ are connected ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] [ If ] [ C ] [ is ] [ damaged, ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminal 1 and the positive terminal ] [ are not connected ] [ Terminal 6 and the positive terminal ] [ are connected ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery. ] [ Terminal 4 and the positive battery terminal ] [ are in the same electrical state ] [ Bulb C ] [ is ] [ in a separate path ] [ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a damaged bulb. ] [ there ] [ is ] [ a closed path ] [ containing ] [ both ] [ the bulb and a battery ] [ there ] [ is ] [ an incomplete circuit ] [ there ] [ is ] [ no closed path ] [ Terminals 1, 2 and 3 ] [ are connected ] [ to the negative battery terminal ] [ each bulb ] [ is ] [ in its own path ] [ There ] [ is ] [ a gap ] [ between terminals 1 and 6 ] [ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ Terminal 4 and the positive battery terminal ] [ are ] [ in the same electrical state ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] [ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ A and C ] [ are ] [ in the same closed path ] [ the open switch ] [ creates a gap ] [ the terminals ] [ are separated by a gap ] [ there ] [ is ] [ a short circuit ] [ bulb B ] [ creates ] [ a gap ] [ Terminal 3 and the positive terminal ] [ are not connected ] [ Terminal 4 and the positive terminal ] [ are not separated ] [ by the gap ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ Terminals 1 and 2 ] [ are connected ] [ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ Terminal 4 and the positive battery terminal ] [ are ] [ in the same electrical state ] [ Terminal 1 and the positive terminal ] [ are not connected ] [ bulbs A and B ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ Terminals 1 and 4 ] [ are connected ] [ Terminal 4 and the positive terminal ] [ are connected ] [ Terminals 1 and 2 ] [ are connected ] [ Terminal 2 and the positive terminal ] [ are not connected ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ The bulb ] [ is not ] [ in the closed path ] [ containing ] [ the battery ] [ the terminals ] [ are separated ] [ by a gap ] [ Terminal 6 and the positive terminal ] [ are connected ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ The battery ] [ in 4 ] [ is not ] [ in a closed path ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] [ there ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] [ a damaged bulb ] [ creates ] [ a gap ] [ there ] [ is ] [ a short circuit ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminal 5 and the positive terminal ] [ are connected ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] [ B and C ] [ are ] [ in the same path ] [ with the battery ] [ the path is not closed ] [ Terminal 1 and the positive terminal ] [ are not connected ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ Terminal 5 and the positive terminal ] [ are connected ] [ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and X ] [ Terminal 2 and the positive terminal ] [ are separated ] [ by the gap ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ the terminals ] [ are not separated ] [ by a gap ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ Circuit 4 ] [ has ] [ no closed paths ] [ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a gap. ] [ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are still ] [ in a closed path ] [ with the battery. ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ The terminals ] [ are ] [ in the same state. ] [ The battery ] [ in 4 ] [ is not ] [ in a closed path ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery. ] [ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] [ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ The battery ] [ in 4 ] [ is not ] [ in a closed path ] [ A and C ] [ are ] [ in the same closed path ] [ Bulb C ] [ is ] [ in a separate path ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ Terminal 1 and the positive terminal ] [ are not connected ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ there ] [ is no gap ] [ between the terminals ] [ there ] [ is ] [ a closed path containing both the bulb and a battery ] [ Terminals 1 and 6 ] [ are not connected ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch X. ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] [ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] [ Terminal 6 and the positive terminal ] [ are connected ] [ the path ] [ is not closed ] [ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ A and C ] [ are ] [ in the same path ] [ Switch Y and bulb A ] [ are not ] [ in the same closed path ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ Switch Y and bulb A ] [ are not ] [ in the same closed path ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery. ] [ Bulb C ] [ was no longer ] [ in a closed path ] [ with the battery ] [ The terminals ] [ are ] [ in the same state. ] [ Bulb B ] [ is ] [ in a separate path ] [ A non-zero voltage ] [ means ] [ that ] [ the terminals ] [ are not connected. ] [ The battery ] [ in 4 ] [ is not ] [ in a closed path ] [ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to a gap. ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are still ] [ in a closed path. ] [ A and C ] [ are not ] [ in the same path ] [ with the battery ] [ Terminals 1 and 2 ] [ are ] [ in the same electrical state ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ A and C ] [ are ] [ in the same closed path ] [ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ Bulbs A and C ] [ are ] [ still ] [ contained ] [ in closed paths ] [ with the battery ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ there ] [ is ] [ a path ] [ containing ] [ A ] [ and ] [ a different path ] [ containing ] [ B and C ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery. ] [ Terminal 6 and the positive terminal ] [ are connected ] [ Circuit 4 ] [ has no closed paths ] [ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state ] [ changes ] [ due to ] [ a gap. ] [ Measuring ] [ voltage ] [ indicates ] [ the place ] [ where ] [ the electrical state changes ] [ due to a gap. ] [ there ] [ is ] [ no closed path ] [ containing ] [ the battery ] [ there ] [ is ] [ a gap ] [ in a circuit ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ there ] [ is ] [ a complete circuit ] [ Bulb B and Bulb C ] [ were still contained ] [ in the same closed path ] [ with the battery. ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ the terminals ] [ are not connected ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ Switch Y and bulb A ] [ are not ] [ in the same closed path ] [ terminal 6 ] [ is separated ] [ by a gap ] [ from the negative battery terminal ] [ there ] [ is no gap ] [ between the terminals ] [ terminal 4 ] [ is separated ] [ by a gap ] [ from the negative battery terminal ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ B and C ] [ are ] [ in the same path ] [ with the battery ] [ Terminal 6 and the positive terminal ] [ are connected ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] [ Terminal 5 and the positive terminal ] [ are connected ] [ The bulb ] [ is not ] [ in the closed path ] [ containing ] [ the battery ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ If ] [ bulb A ] [ burns out, ] [ bulbs B and C ] [ are ] [ still ] [ in a closed path ] [ If ] [ bulb A ] [ burns out, ] [ B and C ] [ are ] [ no longer ] [ in a closed path ] [ with the battery ] [ there ] [ is ] [ a short circuit ] [ Circuit 4 ] [ has ] [ no closed paths ] [ Terminals 1, 2 and 3 ] [ are connected ] [ to the negative battery terminal ] [ A and C ] [ are not ] [ in the same path ] [ A and C ] [ are not ] [ in the same path ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ there ] [ is ] [ an incomplete circuit ] [ Circuit 4 ] [ has ] [ no closed paths ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminals 1 and 4 ] [ are connected ] [ If ] [ C ] [ burns out, ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path. ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ B and C ] [ are ] [ in the same path ] [ with the battery ] [ terminal 1 ] [ is connected ] [ to the negative battery terminal ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ B and C ] [ are ] [ in the same path ] [ with the battery ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ Terminal 3 and the positive terminal ] [ are separated ] [ by the gap ] [ A and C ] [ are ] [ in different paths ] [ with the battery ] [ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] [ Bulb C ] [ was not ] [ in a closed path ] [ the path ] [is not ] [ closed ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ Terminals 1 and 6 ] [ are not connected ] [ bulbs B and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Terminals 1 and 6 ] [ are separated ] [ by the gap ] [ the battery ] [ is contained ] [ in a closed path ] [ in which ] [ there ] [ is ] [ no bulb ] [ there ] [ is ] [ a closed path ] [ containing ] [ both ] [ the bulb and a battery ] [ Bulb B ] [ is ] [ in a separate path ] [ Terminal 5 and the positive terminal ] [ are connected ] [ the terminals ] [ are not connected ] [ the battery ] [ is contained ] [ in a path ] [ in which ] [ there ] [ is ] [ no bulb ] [ the battery ] [ is ] [ in an open path ] [ there ] [ is ] [ an incomplete circuit ] [ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ The terminals ] [ are ] [ in the same state. ] [ B and C ] [ are ] [ in the same path ] [ with the battery ] [ the battery ] [ is contained ] [ in a closed path ] [ in which ] [ there ] [ is ] [ no bulb ] [ Terminals 1 and 6 ] [ are separated ] [ by the gap ] [ there ] [ is ] [ a gap ] [ in a circuit ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ Bulb C ] [ was not ] [ in a closed path ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ A, B and C ] [ are ] [ in different paths ] [ Terminals 1 and 6 ] [ are not connected ] [ the terminals ] [ are not connected ] [ Bulb A ] [ is ] [ still ] [ contained ] [ in a closed path ] [ with the battery and switch Z. ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ each bulb ] [ is ] [ in its own path ] [ If ] [ bulb A ] [ burns out, ] [ B and C ] [ are ] [ no longer ] [ in a closed path ] [ with the battery ] [ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] [ Terminal 4 and the positive terminal ] are not separated by the gap [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ the path ] [ is not closed ] [ If ] [ bulb A ] [ burns out, ] [ neither B nor C ] [ is ] [ in a closed path ] [ each bulb ] [ is ] [ in its own path ] [ Bulb A ] [ was ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ Terminals 1 and 4 ] [ are connected ] [ Bulb C ] [ is ] [ in a separate path ] [ there ] [ is ] [ a complete circuit ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ Bulb B and Bulb C ] [ were ] [ still ] [ contained ] [ in the same closed path ] [ with the battery. ] [ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and X ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ There ] [ is no gap ] [ between terminal 6 and the positive terminal ] [ Bulbs A and C ] [ are ] [ still ] [ in closed paths ] [ with the battery ] [ Bulbs A and C ] [ are ] [ in a closed path ] [ Terminals 1, 2 and 3 ] [ are separated ] [ from the positive battery terminal ] [ by a gap ] [ the terminals ] [ are separated ] [ by a gap ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ There ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] [ there ] [ is ] [ a path ] [ containing ] [ A, C, Z and the battery ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ The battery ] [ in 2 ] [ is not ] [ in a closed path ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ A and C ] [ are ] [ in different paths ] [ with the battery ] [ Bulb A ] [ is ] [ still ] [ in a closed path ] [ with the battery ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ Bulbs A and C ] are [ still ] in closed paths [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ A battery ] [ uses ] [ a chemical reaction ] [ to maintain ] [ different electrical states ] [ at the terminals ] [ the bulb and the battery ] [ are ] [ in a closed path ] [ A and C ] [ are ] [ in different paths ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ The damaged bulb and the other bulb ] [ must be contained ] [ in the same path ] [ there ] [ is ] [ no path ] [ containing ] [ both ] [ switch Y and bulb A ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ Terminals 4, 5 and 6 ] [ are connected ] [ to the positive battery terminal ] [ there ] [ is ] [ no gap ] [ between the terminals ] [ Terminals 4, 5 and 6 ] [ are not connected ] [ to the negative battery terminal ] [ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] [ A and C ] [ are ] [ in the same path ] [ A and C ] [ are ] [ in the same closed path ] [ If ] [ a bulb and a switch ] [ are ] [ in the same path ] [ the switch ] [ affects ] [ the bulb ] [ A and C ] [ are not ] [ in the same path ] [ with the battery ] [ Terminal 6 and the positive terminal ] [ are not separated ] [ by the gap ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ there ] [ is ] [ an incomplete circuit ] [ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] [ each bulb ] [ is ] [ in its own path ] [ the terminals ] [ are separated ] [ by a gap ] [ A and C ] [ are ] [ in the same closed path ] [ there ] [ is ] [ a short circuit ] [ Terminal 1 and the positive terminal ] [ are separated ] [ by the gap ] [ If ] [ C ] [ burns out ] [ then ] [ A and B ] [ are ] [ still ] [ in a closed path ] [ with the battery ] [ When ] [ the switch and the bulb ] [ are contained ] [ in the same path ] [ there ] [ is ] [ a path ] [ containing ] [ both ] [ Z and C ] [ The battery ] [ is contained ] [ in a path ] [ which ] [ does not contain ] [ any other components ]