The specification on a heater coil is 250V, 500W. Calculate the resist

1.	The specification on a heater coil is 250V, 500W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000W to operate at the same voltage?
Answer» (a) The power consumed by a coil of resistance R when connected across a supply v is P = v²/R The resistance of the heater coil is, therefore R = V²/P = (250)²/500 = 125Ω (b) If P = 1000 w then R = V²/P = (250)²/1000 = 62.5Ω

The specification on a heater coil is 250V, 500W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000W to operate at the same voltage?

Answer»

(a) The power consumed by a coil of resistance R when connected across a supply v is P = v²/R

The resistance of the heater coil is, therefore R = V²/P = (250)²/500 = 125Ω

(b) If P = 1000 w then R = V²/P = (250)²/1000 = 62.5Ω