Question

A circuit is supplied with 24 volts and its load offers a total resistance of 400 ohm. What’s the total circuit power?

Answer 1

P = 1.44 Watts

Explanation:

We know that the relation between voltage and current in a simple circuit with a resistor is

V = I.R

Where

V = the voltage of the source

I = current of the circuit

R = resistance

The power is defined as

P = V.I

Which is the same as

P = V.(V/R)

P = (24 v)^2 / (400 ohm)

P = 1.44 Watts