Introduction to AC:Frequency

Frequency

If the loop is rotated at the speed of 2 revolutions each second, the resultant EMF will complete 2 cycles each second. The number of cycles each second is referred to as frequency.

The symbol for frequency is ( f ). It is measured in cycles per second ( CPS ) or more commonly Hertz ( Hz ). The time in which one cycle is completed is known as the periodic time. A frequency of 50 Hz is the standard for the supply system in Ireland.

The frequency of a supply can be calculated as follows:

Example 1

An alternating voltage waveform has a periodic time of 4 mS. Calculate the frequency of the supply?

Solution