CBSE 12 Physics · U2
Current Electricity
CBSE Class 12 Physics Unit II: electric current, drift velocity, mobility, Ohm's law, V-I characteristics, resistance, resistivity, temperature dependence, electrical power, cells, Kirchhoff's rules, and Wheatstone bridge.
Test yourself
A focused, distraction-free run through 25 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 2.1
Electric Current, Drift Velocity, and Mobility
Current as charge flow, electron drift, current density, and mobility.
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Topic 2.2
Ohm's Law, Resistance, and Electrical Power
V-I characteristics, resistance and resistivity, temperature dependence, and power.
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Topic 2.3
Cells, EMF, Internal Resistance, and Cell Combinations
Terminal voltage, lost volts, internal resistance, and series/parallel cells.
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Topic 2.4
Kirchhoff's Rules and Circuit Analysis
Junction rule, loop rule, mixed resistor circuits, and two-loop equations.
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Topic 2.5
Wheatstone Bridge and Mixed Current-Electricity Problems
Balanced bridges, equivalent resistance, and current-electricity synthesis.
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