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Problem

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31 Oct 2021

Given information

It is given that the small immersion heater in a car is used to heat a cup of water from   in 8.0 min and the car has the battery of 12-V. Manufacturer’s claim is given to be 85% efficiency. Also for water, it is known that the specific heat is    and the density is approximately   

The mass of  120 ml water is  0.12 kg

Step-by-step explanation

Step 1.

The power emitted by the heater is     to the heater and the Power absorbed by the water  

The efficiency of the immersion heater is 85%

 

 

The power is the rate of energy transfer or generated.

\text{Power}\,\text{=}\frac{\text{Energy}}{\text{time}}

 

Heat absorbed by the water, increase it temperature by  

 

Here, m is the mass, and c is the specific heat,

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