An electric device gives out 5760J of heat energy in 1min, when curren

1.	An electric device gives out 5760J of heat energy in 1min, when current flows through it at a p.d. of 24V. Find the resistance of the device.
Answer» Heat Energy given out E = 5760J t = 1min. = 60s. p.d. V = 24V Resistance R = V²t/E = (24 x 24 x 60)/5760 = 6Ω R = 6Ω.

An electric device gives out 5760J of heat energy in 1min, when current flows through it at a p.d. of 24V. Find the resistance of the device.

Answer»

Heat Energy given out E = 5760J

t = 1min. = 60s. p.d. V = 24V

Resistance R = V²t/E = (24 x 24 x 60)/5760 = 6Ω

R = 6Ω.