Asked in Consumer ElectronicsHome AppliancesIndustrial EngineeringThomas Edison
Why does an electric iron have a resistance of 15 ohms?
November 02, 2007 7:38PM
I never measured the resistance of an electric iron, but: the 15 ohm resistance is probably required to develop a required 806 watts of power. Using Ohm's law, I(current) = E(voltage)/R(resistance), therefore
I(current) =110 volts/15 ohms = 7.33 Amps (current), and, Power (watts) = E(voltage) X I(current); 110 volts X 7.33 amps = 806 watts. The iron requires that wattage to develop enough heat in the sole of the iron. Hope this helps.