2.7 - Electrical Energy and Power
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Practice Questions
Test your understanding with targeted questions
Calculate the energy used by a 100 W device operating for 1 hour.
💡 Hint: Use W = Pt, where t is 3600 s.
What is the power in watts if 300 joules of energy are consumed in 30 seconds?
💡 Hint: Use P = W/t.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the unit of electrical energy?
💡 Hint: Remember energy and power have different units.
True or False: 1 kWh is equal to 3.6 million joules.
💡 Hint: Consider how kilowatt is defined.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
A factory runs a machine that consumes 1500 W for 24 hours. How much energy does it use in kWh?
💡 Hint: Use Energy = Power x Time and convert to kWh.
If a car's battery supplies 12 V and the total current drawn is 10 A, what is the electrical power used?
💡 Hint: Apply the formula P = VI.
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Reference links
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