11.4 Chapter summary
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11.3 Alternating current

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11.4 Chapter summary (ESCQG)

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 \(P_{av}=I_{rms}V_{rms}\).
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