Question

An electric heater of resistance 230ohm is connected to 230v supply. Calculate the heat energy produced by it in 2 seconds?​

Answer 1

Explanation:

230 joules

Given :

Resistance of the electric heater = 230 ohms = R

Voltage or the potential difference = 230 volts = V

Time = 1 second = t

To find :

Heat energy produced by the heater in 1 second

Heat energy = V×I×t

Using ohms law :

V=I×R

230=I×230

i = \frac{230}{230}i=

230

230

I = 1 ampere

The current passing through the heater is 1 ampere

Now using the formula :

Heat = 230×1×1

Heat = 230 Joules

The heat energy produced is equal to 230 joules

Note: this can also be found with the formula I²RT

Answer 2

GIVEN

Resistance of an electric heater, R = 230 Ω

Potential difference = 230 V

Time, t = 1 s

TO FIND

The heat energy produced in the electric heater in 1 sec.

SOLUTION

We know,

V = IR

V = 230 V

R = 230 Ω

⇒230 = 230 × I

⇒I = 230/230

⇒I = 1 A

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Now,

Heat energy(H.E.) = I²Rt

I = 1 A

R = 230 Ω

t = 1 s

⇒H.E. = (1)² × 230 × 1

⇒H.E. = 1 × 230 × 1

⇒H.E. = 230 Joules

Therefore, the heat energy produced in the electric heater in 1 second is 230 J.