A steady current I flows through an appliance of resistance R. The amount of heat produced by it in time t is:

Correct option is A

​ Correct Option :  (a)  $$I^2 Rt$$

The amount of heat produced by an appliance with resistance ( R ) when a steady current ( I ) flows through it for a time ( t ) can be calculated using Joule's law of heating.
The formula for the heat produced is:

$$H = I^2 R t$$​

 - (H) is the heat produced (in joules),
- (I) is the current (in amperes),
- (R) is the resistance of the appliance (in ohms),
- (t) is the time the current flows (in seconds).

Information Booster : 

• ​The heat produced in a resistor is directly proportional to the square of the current ($I$), the resistance ($R$), and the time ($t$).
  
• This formula is derived from the power equation $P=IR$ and then multiplying by time $t$ to find the total energy (heat) produced: 

 H=P×t=(I²R)×t=I²Rt​