Solved: A small immersion heater can be used in a car to

Chapter 16, Problem 41P

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QUESTION:

Problem 41P

A small immersion heater can be used in a car to heat a cup of water for coffee or tea. If the heater can heat 120 mL of water from 25°C to 95°C in 8.0 min, (a) approximately how much current does it draw from the car’s 12-V battery, and (b) what is its resistance? Assume the manufacturer’s claim of 60% efficiency.

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QUESTION:

Problem 41P

A small immersion heater can be used in a car to heat a cup of water for coffee or tea. If the heater can heat 120 mL of water from 25°C to 95°C in 8.0 min, (a) approximately how much current does it draw from the car’s 12-V battery, and (b) what is its resistance? Assume the manufacturer’s claim of 60% efficiency.

ANSWER:

Step 1 of 5

As the density of water is  

The density is given by,

                                                                 

Here  is the density,  is the mass and  is the volume of the water.

Substitute  for ,  for  in the above equation,

                                                                  

Temperature difference;

                                                                

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