What is the formula for calculating the safe amp draw of a transformer?

The formula for calculating the safe amp draw of a transformer is based on the volt-amperes (VA) rating and the secondary voltage. By using the formula that divides the transformer’s VA rating by the secondary voltage, you obtain the current in amps (I = VA / V). This relationship allows for a straightforward calculation of the current the transformer can safely supply at its rated secondary voltage.

For example, if a transformer has a capacity of 300 VA and operates at a secondary voltage of 120 volts, using the formula would yield:

I = 300 VA / 120 V = 2.5 Amps.

Understanding this formula is crucial for ensuring that the transformer does not exceed its rated current capacity, which could lead to overheating and potential failure.

The other options relate to either incorrect calculations or aspects not pertinent to determining the safe amp draw from a transformer specifically. These alternatives do not correctly connect VA with the appropriate voltage in a way that would provide an accurate or safe amp rating for the transformer in question.