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31. Alternating Current

Resistors in AC Circuits

31. Alternating Current

Resistors in AC Circuits

Multiple Choice
The voltage across a resistor is found to be given by v _R(t) = (10 V) cos[(120 s⁻¹)t]:
a) At what frequency does the AC course operate?
b) If the resistance is 12 Ω, what is the maximum current in this circuit?
c) What is the RMS voltage of the AC source?
Multiple Choice
In a kitchen in the United States, you turn on a toaster, a microwave, and a coffee machine at the same time. All are wired in parallel and are connected to a 20A circuit breaker. If the toaster uses $800 W$ and the coffee machine uses $600 W,$ what is the maximum power the microwave could use without tripping the circuit breaker?