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.

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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.

Topic 4.2

Resistance, Resistivity and Resistor Combinations

Dependence of resistance on length and area, resistivity, series and parallel combinations.

Topic 4.3

Heating Effect and Electric Power

Joule heating, power, commercial unit of energy, fuse action and appliance ratings.

Topic 4.4

Magnetic Effects of Electric Current

Magnetic field lines, fields due to conductors and solenoids, and force on a current-carrying conductor.

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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