AP Physics C: Electricity and Magnetism / Unit 11: Electric Circuits
11.4 Electric Power
Notes
$$P=I\Delta V=I^2R=\frac{(\Delta V)^2}{R}$$
Practice
A 5 Ω resistor carries 4 A. Power:
$I^2R$.
Two bulbs in series on the same battery; the one with larger $R$:
Same current, $P=I^2R$.
Energy used by a 100 W device in 10 s:
$Pt$.
Ready for more? Take the Unit 11 test.