Question

An electric iron of resistance 20 ohm draws a current of 5 amperes. Calculate the heat produced in 30 seconds.

Answer 1

(R) = 20 Ω
(I)= 5 A
(t)= 30 s

Now we know that H= I2Rt

                         use it here     = 5×5×20×30

                                = 15000J=1.5×104J
The heat developed in 30s is 1.5×104J

Answer 2

Answer:

Explanation:

Given :-

Resistance of the iron = 20 ohm          

Current = 5 ampere          

Time = 30 seconds  

To Find :-

Heat Produced.

Formula to be used :-

Heat produced = I²RT    

Solution :-

Putting all the values, we get    

Heat produced = I²RT          

Heat produced = 25 × 20 × 30          

Heat produced = 15000 Joules.

Hence, the heat produced in 30 seconds is 15000 Joules.

Extra Information :-

One Volt Potential Difference - The potential difference between two points in an electric field is the amount of work done in bringing a unit positive charge from one point to another.

Potential Difference = Work done/Charge = W/Q