There are a few different formulas for electrical power. They involve
different combinations of voltage, current, and resistance.
==> Power = (current)² x (resistance)
==> Power = (voltage)² / (resistance)
==> Power = (voltage) x (current) .
In this case right now, we know the power and voltage, and
we need to find the resistance. So maybe it's a good idea
to use the formula that involves power, voltage and resistance.
==> Power = (voltage)² / (resistance)
Multiply each side
by 'resistance': Power x resistance = voltage²
Divide each side
by 'power': Resistance = voltage² / power
= (120 volts)² / (60 watts)
= (14,400 / 60) volts²/watts
= 240 ohms .
