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Standard Brightness Series Which bulb, if either, in a series circuit is brighter? A. first bulb B. second bulb C. They have equal brightness. The brightness of bulbs in series ___ the standard brightness. A. is dimmer than B. have the same brightness as C. is brighter than The current from the battery with the bulbs in series is ____ than the standard current? A. less than B. equal to C. greater than The resistance in the circuit with the bulbs in series is ____ that the standard resistance. A. less than B. equal to C. greater than Parallel Which bulb, if either, in a parallel circuit is brighter? A. left bulb B. right bulb C. They have equal brightness. The brightness of bulbs in parallel ___ to the standard brightness. A. is dimmer than B. is the same brightness as C. is brighter than The current from the battery with the bulbs in parallel is ____ than the standard current. A. less than B. equal to C. greater than The resistance in the circuit with the bulbs in parallel is ____ that the standard resistance. A. less than B. equal to C. greater than The lightbulbs in the circuit below are identical with the A) circuit 1 B) circuit 2 same resistance R. Which circuit produces more light? (brightness power) C) both the same D) it depends on R Points P and Q are connected to a battery of fixed voltage. As more resistors R are added to the parallel circuit, what happens to the total current in the circuit? A) increases B) remains the same C) decreases D) drops to zero Assume that the voltage of the A) 12 V battery is 9 V and that the three B) zero resistors are identical. What is C) 3 V the potential difference across D) 4 V each resistor? E) you need to know the actual value of R 9V A) 12 V In the circuit below, what B) zero is the voltage across R1? C) 6 V D) 8 V E) 4 V R1= 4 W R2= 2 W 12 V In the circuit to the right, what is the current through R1? R2= 2 W A) 10 A B) zero R1= 5 W C) 5 A D) 2 A E) 7 A 10 V F E G Which bulbs are the brightest? A. B. C. D. E. E F G F&G E, F & G Which bulbs are the dimmest? A. B. C. D. E. E F G F&G E, F & G What happens to the brightness of bulb F if I unscrew bulb E? A. B. C. D. goes out gets dimmer stays the same gets brighter What happens to the brightness of bulb E if I unscrew bulb F? A. B. C. D. goes out gets dimmer stays the same gets brighter What happens to the brightness of bulb G if I short circuit bulb F? A. B. C. D. goes out gets dimmer stays the same gets brighter What happens to the brightness of bulb F if I short circuit bulb E? A. B. C. D. goes out gets dimmer stays the same gets brighter A 10 W bulb and a 20 W bulb are connected in series. Which bulb is brighter? A)The 10 W B)The 20 W C)They are the same brightness A 10 W bulb and a 20 W bulb are connected in parallel. Which bulb is brighter? A)The 10 W B)The 20 W C)They are the same brightness 4V 8W W 6 9#48 W WW#48 659W B 95#13 6 WW A #13 D C W W 986W a) A 1. The brightest bulb is b) B c) C d) D e) A and B 4V 8W W 6 9#48 W WW#48 659W B 95#13 6 WW A #13 D C W W 986W a) A The dimmest bulb is b) B c) C d) D e) A and B 4V 8W W 6 9#48 W WW#48 659W B 95#13 6 WW A #13 D C W W 986W Which bulb has the least voltage across it? a) A b) B c) C d) D e) B and C