alleryA 60 W device operates at 12 V. What current does it draw?
- 0.2 A
- 5 A
- 72 A
- 48 A
Show answer and solution
Correct answer: B. 5 A
I = P/V = 60/12 = 5 A.
ICSE Class 10 Electricity: Current and Household Circuits — practice questions — page 3
Explore 100 free Electricity: Current and Household Circuits questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.
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A 60 W device operates at 12 V. What current does it draw?Read the answer and worked solution →A 2 Ω and a 4 Ω resistor are in series on 12 V. What voltage is across the 4 Ω resistor?Read the answer and worked solution →If one parallel lamp fails, what happens to another?Read the answer and worked solution →A 12 Ω and 6 Ω pair in parallel is placed in series with 8 Ω. Find the total resistance.Read the answer and worked solution →A 2 Ω, 4 Ω and 6 Ω series chain is across 24 V. What voltage drops across the 6 Ω resistor?Read the answer and worked solution →Three 6 Ω branches are in parallel across 12 V. What total current leaves the supply?Read the answer and worked solution →A resistive lamp uses 500 W at 10 A. What is its resistance?Read the answer and worked solution →A 12 V source drives 3 A through a resistor. What is the resistance?Read the answer and worked solution →Why can a short circuit cause a fire?Read the answer and worked solution →What happens if a live wire touches an earthed case?Read the answer and worked solution →Match each rule to what it givesRead the answer and worked solution →The right-hand thumb rule is also known as Maxwell's:Read the answer and worked solution →In an electric generator, mechanical energy is used to:Read the answer and worked solution →Magnetic field is a quantity that has:Read the answer and worked solution →Outside a magnet, field lines run from the:Read the answer and worked solution →Two magnetic field lines can never cross because a compass would then point:Read the answer and worked solution →In Fleming's left-hand rule the thumb points along the:Read the answer and worked solution →The frequency of alternating current in India is:Read the answer and worked solution →True or false on magnetic effectsRead the answer and worked solution →Which way does the effect runRead the answer and worked solution →Quick picks on current and magnetismRead the answer and worked solution →Magnetic field lines are always:Read the answer and worked solution →Who discovered in 1831 that a moving magnet can generate current?Read the answer and worked solution →A compass needle is in fact a small:Read the answer and worked solution →The earth wire in a house is recognised by insulation coloured:Read the answer and worked solution →Fill the gaps on magnetic effectsRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →A changing magnetic field inducing current in another conductor is called:Read the answer and worked solution →Current can be induced in a coil by moving it in a field or by:Read the answer and worked solution →The main advantage of AC over DC is that power can be:Read the answer and worked solution →
Worked practice questions
A 2 Ω and a 4 Ω resistor are in series on 12 V. What voltage is across the 4 Ω resistor?
- 6 V
- 12 V
- 4 V
- 8 V
Show answer and solution
Correct answer: D. 8 V
Total resistance is 6 Ω, current is 2 A, so the 4 Ω drop is 8 V.
If one parallel lamp fails, what happens to another?
- It may keep working
- It always fails too
- It loses all voltage
- It supplies current
Show answer and solution
Correct answer: A. It may keep working
Each lamp in parallel has its own path, so one open branch need not stop another.
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