Question 17.1: TURN ON THE LIGHT GOAL Apply the concept of current. PROBLEM...
TURN ON THE LIGHT
GOAL Apply the concept of current.
PROBLEM The amount of charge that passes through the filament of a certain lightbulb in 2.00 \mathrm{~s} is 1.67 \mathrm{C}. Find (a) the average current in the lightbulb and (b) the number of electrons that pass through the filament in 5.00 \mathrm{~s}. (c) If the current is supplied by a 12.0-V battery, what total energy is delivered to the lightbulb filament during 2.00 \mathrm{~s} ? What is the average power?
STRATEGY Substitute into Equation 17.1a
I_{\text{av}} \equiv \frac{\Delta Q}{\Delta t} [17.1a]
for part (a), then multiply the answer by the time given in part (b) to get the total charge that passes in that time. The total charge equals the number N of electrons going through the circuit times the charge per electron. To obtain the energy delivered to the filament, multiply the potential difference, \Delta V, by the total charge. Dividing the energy by time yields the average power.
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