Question

Resistance of a 230 V heating device is 460 2.
Calculate the heat energy produced by it in 10 minutes.
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Answer 1

Answer:

6897 joules

Explanation:

voltage=229 volt

resistance=4602

time=10 mi30

H=V square/R (t)

=>(230)^2/4602(600)

=>6897 joules(approx)

Answer 2

Answer:

The heat energy produced by the heating device is 69kJ.

Explanation:

The heat energy produced by a heating device is given as,

$H=I^2Rt$       (1)

Where,

H=heat energy

I=current flowing through the heating device

R=resistance of the heating device

t=times taken to heat the device in seconds

Also,

$I=\frac{V}{R}$           (2)

V=potential difference across the heating device

By putting equation (2) in equation (1) we get;

$H=\frac{V^2}{R^2}\times Rt=\frac{V^2}{R}\times t$         (3)

From the question we have,

V=230v

R=460Ω

t=10min=10×60=600second

By using equation (3) we get;

$H=\frac{230\times 230}{460}\times 600=69000J=69kJ$

Hence, the heat energy produced by the heating device is 69kJ.