Question

the element of 500 watt electric iron is designed for use on a 200 volt supply. What is the value of resistance needed in series with the element to use the iron at 240 volt supply.

Answer 1

p=500W
v=240V
p=v^2/R
R=v^2/p
R=57600/500
R=115.2

Answer 2

Answer:

i too have the same doubt