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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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