Question

State Joules law of Heating. Calculate Heat produced when 18000C of charge is transfered in one hour through a p.d. of 50V.

Answer 1

When a electric current is passed through a high resistance wire the resistance wire becomes very hot and produces heat.This is known as Joules law of Heating

Answer 2

When current I flow through a resistor of electric resistance R, heat is produced. The heat produced H depends directly on the square of the current, resistance and time t for which the current is allowed to pass. H=I2Rt, Is called Joule's law of heating.

H=I^2RT

I=18000/3600=5A

R=50/5=10OHM

H=5×5×10×3600

=9,00,000