Question

write joule's law of heating

Answer 1

"I" current is flowing at a time period "t" through a conductor with resistance "R" then the heat dissipated from the conductor would be directly proportional to

>square of the current

>resistance

>time taken

H proportional to I^2

H proportional to R

H proportional to T

H = I ^2 RT k(k is constant of proportionality which equals 1)

H = I^ 2* R *T

by applying ohms law in the given expression
H = I *I *R * T
H = V*I *T( V= I * R)

Answer 2

The law implies that heat produced in a resistor is

# directly proportional to the square of current (I ^2) for a given resistance,

# directly proportional to the resistance (R) for a given current,

# directly proportional to the time (t) for which the current flows through the resistor.

consider a current I flowing through a resistor of resistance R. Let the potential difference across it be V.Let t be the time t be the time during which a charge Q flows across. The work done (W) in moving the charge Q through the potential difference V is VQ. Therefore the source must supply energy equal to VQ in time t.

The energy gets dissipated in the resistor as heat. Thus for a steady current I, the amount of heat H produced in time t is

H=W=VQ

SINCE, Q=It

H = V I t

BY APPLYING OHM'S LAW,

WE GET H= I^2 Rt

This is known as joule's law of heating.