A standard primary transformer rated at 200 VA can handle how much current on the primary side if the primary voltage is 100 volts?

To determine the current on the primary side of a transformer, you can utilize the formula that relates power, voltage, and current:

Power (in watts) = Voltage (in volts) × Current (in amps).

In this case, you have a transformer rated at 200 VA (volt-amperes), which, for practical purposes, can be treated as 200 watts in a purely resistive circuit. Given the primary voltage is 100 volts, you can rearrange the formula to solve for current:

Current = Power / Voltage.

Substituting the values into the equation gives you:

Current = 200 VA / 100 V = 2 A.

This result indicates that the transformer can handle a current of 2 amps on the primary side when the voltage is at 100 volts, making this the correct answer. Understanding this calculation is essential for working with transformers, as it helps ensure that equipment operates within its rated capacities to prevent overheating and potential failure.