Amps drawn by a 10 W USB device at 5 V

Answer: current = 2 A (equivalent resistance 2.5 Ω).

What we know

Power: 10 W
Voltage: 5 V

Step by step

Given: P = 10 W, V = 5 V
Formula: I = P / V
Substitute: I = 10 / 5
Result: I = 2 A

All results

Current	2 A
Equivalent resistance	2.5 Ω

Open the watts to amps calculator with these numbers → and change any of them.

The physics

Electrical power is voltage times current, P = V·I. Rearranged, the current a device draws is its power divided by the supply voltage: I = P / V. That single step turns any appliance's wattage into the amps flowing through its cord and the circuit behind it.