Question

An electric heater of resistance 230 ohm is connected to 230V supply. Calculate the heat energy produced by it in 1 second.?

Answer 1

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

$\rule{120}2$

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.

Answer 2

Answer:

230 joules

Explanation:

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 = 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