Practice Heating Effect Of Current (8.8) - Electricity and Magnetism

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9 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What happens to a resistor when current flows through it?
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Consider what happens to metal when you run electricity through it.
Question 2.
What is the formula for calculating heat produced in a resistor?
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Remember the relationship between heat, current, resistance, and time.
3Question 3.
What is the primary effect of current flowing through a resistor?
- It cools down
- It produces heat
- It changes color
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Think about what happens when appliances are plugged in.
4Question 4.
True or False: The heat produced is directly proportional to the square of the current.
- True
- False
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Remember the formula we discussed.
Question 5.
A circuit causes a copper wire with a resistance of 2 ohms to carry a current of 10 A for 30 seconds. How much heat is produced?
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Apply the formula correctly and calculate.
Question 6.
If an electrical appliance operates at a resistance of 12 ohms and produces 1500 Joules of heat, what was the current and for how long did it operate?
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Choose a reasonable current to find the time.

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