Q. 9

# An immersion heat

Given

The operating voltage V

Power consumed P,

Now the resistance of the immersion heater,

Mass of water m is ,

m =1100× 1000

= 10 Kg

We know specific heat of water, s = 4200 Jkg-1 K-1

Given rise in temperature, θ = 25°C

Heat required to raise the temperature of the given mass of water is given by –

Let t be the time taken to raise the temperature of water.

Given the heat evolve is only 60%.

So,

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