The specification on a heater coil is 250 V, 500 W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000 W to operate at the same voltage.
Let the resistance of the coil be R
Given
voltage =250 V
power =500 W
The power P consumed by a coil of resistance R when connected across a supply V is given by Joule’s heating effect -
Now when, P = 1000 W