Sample EC questions

# Sample EC questions - 1 3 2 4 12 V A B 6 volts A C B D S 8....

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7) What happens to the brightness of bulbs A and B when a wire is connected between  points 1 and 2? (A)  Both increase (B)  Both decrease (C)  They stay the same (D)  A becomes brighter than B (E)  Neither bulb will light 1 2 A B 8) What is the potential difference between points A and B? (A)  0 V (B)  3 V (C)  6 V (D)  12 V (E)  None of the above A B 12 V 4. Four identical bulbs are connected to a 12-volt battery, as shown.  If bulb  4 were removed, what voltage (in volts) would be measured across the  empty socket? A. 0 B. 3 C. 4 D. 6 E. 12 6. Three identical bulbs are connected to a 6-volt battery and a switch as  shown.  When the switch is closed, the potential difference between points  A and B changes: A.  from 0 volts to 6 volts B.  from 0 volts to 3 volts C.  from 3 volts to 0 volts D.  from 3 volts to less than 3 volts E.  from 3 volts to more than three volts

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Unformatted text preview: 1 3 2 4 12 V A B 6 volts A C B D S 8. Compare the resistance of branch 1 with that of branch 2. A branch is a section of a circuit. The resistance of branch 1 is _____ branch 2. (The resistors are identical) A. Four times B. Double C. The same as D. Half E. One quarter (1/4) Branch 1 Branch 2 3. [5 points total] Compare the relative readings on the ideal ammeters in each of the four circuits (a-d). The light bulbs and the batteries are identical. Explain . 7. In the circuit shown, switch S is initially open. When the switch is closed, what happens to the brightness of bulb A? A. it gets brighter B. it stays the same C. it gets dimmer 8. For the same circuit as in Problem 7, what happens to the brightness of bulb B when the switch is closed? A. it gets brighter B. it stays the same A A A A (a ) (b ) (c) (d ) C. it gets dimmer...
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## Sample EC questions - 1 3 2 4 12 V A B 6 volts A C B D S 8....

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