Frequency is the rate at which current changes direction per second . It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second.20 Haz 2015
Frequency is the rate at which current changes direction per second . It is measured in hertz (Hz), an international unit of measure where 1 hertz is equal to 1 cycle per second.20 Haz 2015