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Solved: A small immersion heater can be used in a car to
Chapter 16, Problem 41P(choose chapter or problem)
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.
Questions & Answers
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;