A 40 watt fluorescent bulb is rated for use in a 120 volt line. During a brownout the actual voltage drops to 102 V. The actual power dissipated in the bulb under these conditions is
A. 30.0 W.
B. 47.1 W.
C. 28.9 W.
D. 0.283 W.
Answer: C
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Imagine that we have two identical metal spheres on insulating stands that we give the same negative charge. If we slowly bring the spheres closer and closer together, the charge per unit area ? on each sphere will at the point nearest the other sphere
A. become increasingly negative. B. become less negative. C. remain constant.
Resistance and Resistivity: The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 ? ? m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A. 17 mV B. 0.90 mV C. 1.7 mV D. 10 mV E. 90 mV
A 12.0-V battery (potential source) is connected across a 6.00-µF air-filled capacitor
(a) How much energy can be stored this way? (b) How much excess charge is on each plate of the capacitor?
If a light bulb has half the resistance of a 50-W lightbulb, what would be its wattage? Assume both bulbs are attached to the same 120-V circuit
a. More information is needed. c. 200 W b. 25 W d. 100 W