Practice Problems

Problem 1

For the circuit above, find the source RMS voltage, the turns ratio for the transformer, and the power produced by the source.

Problem 2

What is the source current and turns ratio of the transformer?

Problem 3

You want to plug a device with an ADC into the wall socket. The ADC requires \(V_{in} = 30\ \text{V}_{RMS}\). Your group determines that you need to put something in to reduce the voltage before it gets to the ADC. One design partner thinks you need to add a resistive voltage adapter. The other says you should use a transformer in the circuit. Which option is right and why?

Problem 4

What is a semiconductor device that allows current to flow in only one direction?

a. Diode   b. Capacitor   c. Circuit breaker   d. Transistor

Problem 5

What does a capacitor do in an AC-to-DC converter?

a. Eliminates the bias
b. Kills the negative voltage
c. Smooths the output
d. Protects the circuit