# PHYSICS

The peak value of the ac current in a circuit is 6.0 A, and peak value of the ac voltage applied to the circuit is 8.9 V. What is the average power P delivered to the circuit?

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1. The average power dissipated in a 47-Ù resistor is 5.9 W. What is the peak value I0 of the ac current in the resistor?

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2. Average power is half the product of peak voltage and peak current.

Avg. Power = (1/2)Io^2*R

Solve for Io

Peak voltages and currents are usually not used in AC calculations; instead, r.m.s. (root mean square) values are used. They are 0.707 (1/sqrt2) times the peak value

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