An electric iron is rated 1000W, 230V. What is the resistance of its elements?
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Correct Answer: Option B
Explanation:
Electric Power = IV = I2R = V[sup]2[/sup]/R thus for a device rated 1000 W, 230V, from the relation P = V[sup]2[/sup]/R, 1000 = (230)[sup]2[/sup]/R
=> R = (230)[sup]2[/sup]/1000
= 52900/1000 = 52.9Ω
Electric Power = IV = I2R = V[sup]2[/sup]/R thus for a device rated 1000 W, 230V, from the relation P = V[sup]2[/sup]/R, 1000 = (230)[sup]2[/sup]/R
=> R = (230)[sup]2[/sup]/1000
= 52900/1000 = 52.9Ω