__________ a) Suppose all the resistors in the circuit are non-ohmic (do not obe

Question

__________ a) Suppose all the resistors in the circuit are non-ohmic (do not obey Ohms law). Now:

A) Kirchhoffs laws do not apply

B) Kirchhoffs first law still applies, but Kirchhoffs second law does not apply

C) Kirchhoffs second law still applies, but Kirchhoffs first law does not apply

D) Both of Kirchhoffs laws apply

__________ b) Suppose the resistor R2 is an incandescent bulb that heats up when current passes through it. As the bulb heats up, the current I1 I will

A) increase B) decrease C) remain the same

__________ c) Suppose R1 breaks. Now, the current through R2 would

A) increase B) decrease C) remain the same

__________ d) If one of the power sources is turned around (so the positive and negative terminals are reversed), the current through R1 would

A) increase B) decrease C) remain the same

2. In the information section, it says that Kirchhoffs second law is equivalent to the law of conservation of energy. Explain why this is true.

1. Look at the diagram for the two loop circuit in procedure 1. __________ a) Suppose all the resistors in the circuit are non-ohmic (do not obey Ohm½s law). Now: A) Kirchhoff½s laws do not apply B) Kirchhoff½s first law still applies, but Kirchhoff½s second law does not apply C) Kirchhoff½s second law still applies, but Kirchhoff½s first law does not apply D) Both of Kirchhoff½s laws apply __________ b) Suppose the resistor R2 is an incandescent bulb that heats up when current passes through it. As the bulb heats up, the current I1 I will A) increase B) decrease C) remain the same __________ c) Suppose R1 breaks. Now, the current through R2 would A) increase B) decrease C) remain the same __________ d) If one of the power sources is turned around (so the positive and negative terminals are reversed), the current through R1 would A) increase B) decrease C) remain the same 2. In the information section, it says that Kirchhoff½s second law is equivalent to the law of conservation of energy. Explain why this is true.

Explanation / Answer

1. (a) D (b) B (c) B (d) D 2. Kirchhoff's second law states that the total voltage in a closed loop is equal to zero. So this implies that the net voltage in a closed loop is 0. Voltage is the energy per unit charge. Thus the net energy per unit charge that is entering the loop is equal to the net energy per unit charge that the exiting.

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