## Summary

Electrical generators convert mechanical energy into electrical energy.

Electric motors convert electrical energy into mechanical energy.

There are two types of generators – AC and DC. An AC generator is also called an alternator.

There are two types of motors – AC and DC.

Alternating current (AC) has many advantages over direct current (DC) listed previously.

The root mean square (rms) value of a quantity is the maximum value the quantity can have divided by \(\sqrt{\text{2}}\).

RMS values are used for voltage and current when dealing with alternating current, \(I_{\text{rms}} = \dfrac{I_{\text{max}}}{\sqrt{\text{2}}}\) and \(V_{\text{rms}} = \dfrac{V_{\text{max}}}{\sqrt{\text{2}}}\).

The average power dissipated in a purely resistive circuit with alternating current is \(P_{av}=I_{rms}V_{rms}\).