Question

An electric heater draws a current of 3.5 A at a p.d. of 250 V. Calculate the power of 4 such heaters.

Answer 1

I = 3.5 A; p.d. = 250 V

∴ Power of one heater = I × V

= 3.5 × 250

= 875 W

∴ Power of 4 heaters = 875 × 4 = 3500 W