Question

a heater coils of resistace 0.40 ohm carries a current I if the power of the power of the heater is 1kw calculate the magnitude of current and potenntial difference v

Answer 1

Potential difference V = I R 
Power = P = V² / R 
        V² = P R = 1000 w * 0.40 Ω = 400 WΩ
                V = 20 volts
 
       current = V/R = 20/0.40 = 50 amp