If a transformer has a 120v primary, 24v secondary, and a VA rating of 40, what is the safe amp draw of the transformer?

To determine the safe amp draw for the transformer, you need to use the formula:

[ \text{VA rating} = \text{Voltage} \times \text{Current} ]

In this case, the VA rating is 40. The secondary voltage of the transformer is 24 volts, so you can rearrange the formula to solve for the current (in Amperes):

[ \text{Current} = \frac{\text{VA rating}}{\text{Voltage}} ]

Substituting in the values for the secondary side:

[ \text{Current} = \frac{40 , \text{VA}}{24 , \text{V}} ]

Calculating that gives:

[ \text{Current} = 1.67 , \text{Amps} ]

This means that the transformer can safely deliver a current of approximately 1.67 Amps at its 24V secondary output without exceeding its VA rating of 40. This is crucial in preventing overheating or failure of the transformer due to excessive current draw.

Understanding the relationship between voltage, current, and power is fundamental in HVAC and electrical work, as it ensures that components operate within their specified limits to maintain system