What formula is used to find primary transformer amps at full load?

To find the primary transformer amps at full load, the formula used is P ÷ E = I. In this context, P represents the power in watts (or kVA when dealing with transformers), E represents the voltage in volts, and I signifies the current in amps.

When you want to determine how much current a transformer draws at full load, you need to know the power it is converting and the voltage. By rearranging the basic electrical power equation P = E × I, you can isolate the current by dividing power by voltage, which leads to the formula indicated. This formula effectively calculates the current required to support the specified power level at a given voltage.

Understanding this relationship is critical for electricians and linemen when sizing equipment and ensuring that transformers operate within their designed specifications for safety and efficiency.