7. A bulb and a battery are connected as shown below. Which is true about the cu

Question

7. A bulb and a battery are connected as shown below. Which is true about the current at various points in this circuit? a) The current is largest at A. b) The current is largest at B. c) The current is largest at C. d) The current is largest at D. e) The current is the same everywhere. f) The current is the same between A and B and smaller than between C and D. g) The current is the same between A and B and larger than between C and D. h) The current is the same everywhere except in the bulb. i) The current is the same everywhere except in the battery.

8. A second identical bulb is added to the circuit with one bulb, as shown. Compare the current at A now to the current at A with only one bulb. 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 is now half as large as before. e) The current at A is now smaller than before but not half as large.

9. Compare the potential difference across the bulb, VBC, now to what it was before 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. f) None of these is correct.

10. 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.

11. A second identical bulb is added to the circuit with one bulb, as shown. Compare the current at A now to the current at A before with only one bulb. 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 is now half as large as before. e) The current at A is now smaller than before but not half as large.

12. Compare the current through the bulb connected between B and C now to the current through it before when there was only one bulb. a) The current is larger than it was before. b) The current is the same as before. c) The current is smaller than it was before.

13. Compare the brightness of the bulb connected between B and C now 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.

14. Compare the potential difference across the bulb, VBC, now to what it was before 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. f) None of these is correct.

The following questions refer to the circuit shown in which four identical bulbs are connected to a battery. The switch, S, is initially closed as shown in the diagram.

15. Which of the following correctly ranks the bulbs in brightness? a) All bulbs are equally bright. b) 1 is brightest, 2 next brightest, 3 next brightest and 4 dimmest c) 1 is brightest. 2 and 3 are equally bright, and each is dimmer than 1. 4 is dimmest. d) 1 and 4 are equally bright. 2 and 3 are equally bright, and each is dimmer than 1 or 4. e) 2 and 3 are equally bright. 1 and 4 are equally bright, and each is dimmer than 2 or 3. f) 1 is brightest, 4 is next brightest. 2 and 3 are equally bright, and each is dimmer than 4. g) None of these is correct.

16. Which of the following correctly ranks the currents flowing through the bulbs? a) All bulbs have the same current flowing through them. b) The current through 1 is largest, 2 next largest, 3 next largest and 4 smallest. c) The current through 1 is largest. 2 is the same as 3, and each is smaller than 1. 4 is smallest. d) The current through 1 and 4 is the same. 2 is the same as 3, and each is smaller than 1 or 4. e) The current through 2 and 3 is the same. 1 is the same as 4, and each is smaller than 2 or 3. f) The current through 1 is largest, 4 is next largest. 2 is the same as 3, and each is smaller than 4. g) None of these is correct.

17. Which of the following correctly ranks the potential differences across the bulbs? a) All bulbs have the same potential difference across them. b) The potential difference across 1 is largest, 2 next largest, 3 next largest and 4 smallest. c) The potential difference across 1 is largest. 2 is the same as 3, and each is smaller than 1. 4 is smallest. d) The potential difference across 1 is the same as 4. 2 is the same as 3, and each is smaller than 1 or 4. e) The potential difference across 2 is the same as 3. 1 is the same as 4, and each is smaller than 2 or 3. f) The potential difference across 1 is largest, 4 is next largest. 2 is the same as 3, and each is smaller than 4. g) None of these is correct.

18. Bulbs 1 and 3 are connected a) In series. b) In parallel. c) In series and parallel. d) Neither in series nor parallel.

19. What happens to the current through bulb 1 if the switch, S, is opened? a) It increases. b) It remains the same. c) It decreases. d) Not enough information is given.

20. What happens to the current through bulb 2 if the switch, S, is opened? a) It increases. b) It remains the same. c) It decreases. d) Not enough information is given.

Explanation / Answer

7.

the bulb is connected in series with the battery and we know that in series current remains same

e) The current is the same everywhere

8)

according to ohm's law , i = V/R

adding another bulb doubles the resistance in the circuit, hence as per the formula above , the current becomes half

d) The current at A is now half as large as before

9)

V = i R

the resistance of the the bulb remains same between B and C but the current has becomes half

hence Voltage also becomes half

d) The potential difference is now half as large as before.

10)

since the bulbs are connected in parallel , each bulb share the same voltage equal to battery voltage. hence the voltage does not get divided.

a) The bulb is brighter than it was before

Related Questions

Navigate

• Browse (All)
• Browse 7
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.