CBSE 10 Science · U4
Effects of Current
Syllabus-listed 13-mark theory unit covering electric current, potential difference, Ohm's law, resistance, resistivity, resistor combinations, heating effect, electric power, magnetic field and field lines, magnetic field due to a current-carrying conductor, coil and solenoid, force on a current-carrying conductor, Fleming's left-hand rule, AC/DC, frequency of AC, and domestic electric circuits. Motor, electromagnetic induction and electric generator are formative-reinforcement topics.
Test yourself
A focused, distraction-free run through 65 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 4.1
Current, Potential Difference and Ohm's Law
Electric charge flow, current, potential difference, resistance and V-I graphs for ohmic conductors.
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Topic 4.2
Resistance, Resistivity and Resistor Combinations
Dependence of resistance on length and area, resistivity, series and parallel combinations.
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Topic 4.3
Heating Effect and Electric Power
Joule heating, power, commercial unit of energy, fuse action and appliance ratings.
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Topic 4.4
Magnetic Effects of Electric Current
Magnetic field lines, fields due to conductors and solenoids, and force on a current-carrying conductor.
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Topic 4.5
AC, DC and Domestic Electric Circuits
Direct and alternating current, household supply, live-neutral-earth wiring, fuse action and circuit safety.
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