Concept #1: RMS Current and Voltage

Practice: An AC source operates with a 0.05 s period. 0.025 s after the current is at a maximum, the current is measured to be 1.4 A. What is the RMS current of this AC circuit?

An alternating current is supplied to an electronic component with a rating that it be used only for voltages below 16V. What is the highest Vrms that can be supplied to this component while staying below the voltage limit? A) 16√2 VB) 8√2 VC) 256 VD) 8 V

In a sinusoidal AC circuit with rms voltage V, the peak-to-peak voltage equalsA) V/2B) V/ √2C) 2√2VD) √2VE) 2V

Explain why AC voltage is often described using the root mean square value rather than the average voltage.

The output of a generator is given by v(t) = a sin(ω t), where a = 341 V. Find the rms current in the circuit when this generator is connected to a 121 Ω resistor.
1. 1.25443
2. 1.15979
3. 2.07892
4. 0.537758
5. 0.295654
6. 1.35156
7. 0.995925
8. 1.12717
9. 0.915847
10. 1.99276

In a sinusoidal ac circuit with rms voltage V, the peak-to-peak voltage equalsa. √2Vb. 2Vc. V/√2d. 2√2Ve. V/2

What is the rms current provided to a 60-W light bulb that is plugged into a 220-V rms wall receptacle? (Express your answer to two significant figures.)

The peak-to-peak current passing through a 150-Ω resistor is 25.0 A. Find the rms current through the resistor. (Express your answer to three significant figures.)