total induced voltage in the secondary coil must be equal to the volts per turn ratio of the primary coil multiplied by the

number of turns in the secondary. This may be written:

Solving this equation for the ratio

To illustrate the use of the above formula, take a transformer with a primary winding of 3,000 turns connected to a 240-

VAC source and a secondary winding of 300 turns. You can easily calculate the voltage across the secondary from the

equation