For questions 11-13, a second identical bulb is to the circuit in Question 6 as

Question

For questions 11-13, a second identical bulb is to the circuit in Question 6 as hown bel added 11. Compare the current at A now to the current at A with only one b A. The current at A is now twice as large as before. B. The current at A is now larger than before but not twice as large C. The current at A is the same as before. D. The current at A now half large as before. E. The current at A is smaller than but not half as large 12. Compare the potential difference across the bulb, vec, now to what it was betore when there was only one bulb A. The potential difference is now twice as large as before B. The potential difference is now larger than before but not twice as large. C. The potential difference is the same as before. D. The potential difference is now half as large as before. E. The potential difference is now smaller than before but not half as large. 13. Compare the brightness of the bulb connected between B and C to its brightness before when there was only one bulb. A. The bulb is brighter than it was before. B. The bulb is just as bright as before. C. The bulb is dimmer than it was before Question 14 refers to the figure on the right in which all three resistors are identical, RA Re Rc. Ra Ra 14. What can you say about the current iA through RA? A. ie, only B. ic, only ia ic Page 5 of 7 Physics 202 Electricity and Optics

Explanation / Answer

11. now I = V /2R

and with only one bulb, I = V/R = 2 (I_now)

Ans(D)

12. V_now = V/2

V_before = V

Ans(D)

13. current was greater before.

Ans(A)

14. series elements carry same current.

iA = iB = iC

Ans(C)

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