Electric Energy: Consumption and Conservation — Practice Quiz
Kerala Board · Class 10 · Physics
Try a 4-question quiz on Electric Energy: Consumption and Conservation for Kerala Board Class 10 Physics: tap an answer to check it and see why.
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Quick Quiz: Electric Energy: Consumption and Conservation
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What is the heating effect of electric current?
Which material is commonly used for making heating coils in electric appliances?
A current of 2 A flows through a 50 Ω resistor for 5 minutes. Calculate the heat produced.
What is the SI unit of electric power?
Sample Questions
According to Joule's law, the heat produced in a conductor is directly proportional to:
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Square of current (I²), Resistance (R), Time (t)
Joule's law states: H = I²Rt. Heat is directly proportional to the square of current, resistance, and time for which current flows.
Which of the following equations represent electric power correctly?
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P = I²R, P = V²/R, P = VI
The three correct equations for electric power are: P = I²R, P = V²/R, and P = VI. These are derived using Ohm's law and the definition of power.
What is one kilowatt-hour (1 kWh) equal to in joules?
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3.6 × 10⁶ J
1 kWh = 1000 W × 3600 s = 3,600,000 J = 3.6 × 10⁶ J. This is the commercial unit of electric energy.
A 100 W bulb operates for 10 hours. Calculate the energy consumed in kWh.
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1 kWh
Energy = Power × Time E = 100 W × 10 h = 1000 Wh = 1 kWh Or using formula: E = (Power in watts × time in hours)/1000 = (100 × 10)/1000 = 1 kWh
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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