There are two main equations for power in the field of current electricity:

P = I² R

P = V²/R

where P = power (watts), V = voltage (volts), R = resistance (ohms), I = current (amps)

[am4show have=’p9;p58;’ guest_error=’Guest error message’ user_error=’User error message’ ]

Using these three equations (the two above and V = IR) will solve most of your problems in physics having to do with current electricity. However, there are a few things to keep in mind before you dive in too deeply…

Click here to go to your next lesson on Hair Dryers.

[/am4show]