Question

How much power is produced if a voltage of `8 V` is applied to a circuit with a resistance of `16 Omega`?

Answer 1

Use Ohm's law: V=IR, to obtain the current I. Then use `P=I times V` to get the power. You will find P=4 Watts.

Explanation:

Use Ohm's law: V=IR, to obtain the current I.

Rearrange to make I the subject:
I = V/R = 8V / 16 Ohms = 0.5 Amps.

Then use `P=I times V` to get the power.
`P=(0.5 Amps) times (8text{ Volts}) = 4` Watts

P=4 Watts.