Characteristics of Alternating Currents problem 23

The heating effect in the resistor depends on the magnitude of according to the formula of power which is given as

where is the resistance of the resistor.

Therefore, since the square of any non-zero number is always positive, an alternating current with a mean value of zero will give rise to a heating effect in a resistor.

Transmission of electrical energy is frequently achieved using alternating high voltages. Suggest why