Question

A camcorder has a power rating of 10 watts. If the output voltage from its battery is 3 volts, what current does it use?

Answer 1

The power is calculated using the following rule:
Power = voltage * current
We are given that:
power = 10 watts
voltage = 3 volts

Substitute with the givens in the above equation to get the value of the current as follows:
P = V*I
10 = 3*I
current (I) = 10/3 amperes