An electric iron uses 8.0 A of current and has a power rating of 1100 W. The resistance of the iron is
A) 0.0072 W.
B) 17 W.
C) 138 W.
D) 8800 W.

Question

Quizplus · Accepted Answer

The resistance of the electric iron can be calculated using Ohm's law and the power formula. The power formula is P = IV, where P is power in watts, I is current in amperes, and V is voltage in volts. We can rearrange this to find V = P/I. Once we have the voltage, we can use Ohm's law, V = IR, to find the resistance, R = V/I.Given P = 1100 W and I = 8.0 A, we first find the voltage: V = 1100 W / 8.0 A = 137.5 V.Then, we find the resistance: R = V / I = 137.5 V / 8.0 A = 17.1875 Ω, which rounds to 17 Ω, making option B correct.

An Electric Iron Uses 8