An 800W power supply at full load drawing from 220VAC (single phase) requires approximately how many amps?

To find the current draw in amps from a power supply operating at 800 watts on a 220VAC circuit, the formula used is derived from the relationship between power, voltage, and current, represented as:

Power (P) = Voltage (V) × Current (I)

Rearranging this formula to find current gives:

Current (I) = Power (P) / Voltage (V)

By substituting the values for power and voltage, we have:

I = 800W / 220V

Calculating this gives:

I ≈ 3.64A

Therefore, the power supply drawing 800 watts at 220 volts requires approximately 3.64 amps, which corresponds to the correct answer. This understanding is crucial when assessing the electrical load requirements and ensuring that the circuit can safely support that load without experiencing overloads or failures.