Chapter 7, Problem 14STP

To determine

To Calculate: The voltage that the generator produces at $\text{60 Hz}$ .

The way to change the voltage to 120 V.

Answer to Problem 14STP

To change the voltage to $120\text{ V}$ , the rotation rate should be changed to $\underset{\_}{\text{600 Hz}}$ .

Explanation of Solution

Given:

According to the graph,

Voltage produced at $\text{60 Hz}=12\text{ V}$

Calculation:

The rotation rate at $120\text{ V}$ is calculated as:

Rotation rate at $12\text{ V}$ = $\text{60 Hz}$

Rotation rate at $1\text{ V}$ = $\frac{\text{60 }}{12}=5\text{ Hz}$

Rotation rate at $120\text{ V}$ = $\text{5}\times \text{120 = 600 Hz}$ .

Conclusion:

To change the voltage to $120\text{ V}$ , the rotation rate should be changed to $\underset{\_}{\text{600 Hz}}$ .