# Energy lost due to resistance?

1. Jul 9, 2015

If electricity passes through a system at 12 volts, with 0.42 Amps of current, and 28.8 ohms of resistance, how do you calculate the energy lost in joules?

2. Jul 9, 2015

### Staff: Mentor

Power multiplied by time...

3. Jul 9, 2015

### mathman

$P=I^2R$ is energy loss per unit time.