Class 12 Physics — Chapter 3: Current Electricity
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 12 Physics Chapter 3, "Current Electricity", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Current Electricity" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Current Electricity, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Physics mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Current Electricity (Class 12 Physics)
This chapter covers electric current, Ohm's law and resistance, combinations of resistors and cells, and Kirchhoff's laws including the Wheatstone bridge.
- Current & drift velocity
- Current is the rate of flow of charge (I = q/t); it arises from the slow drift of electrons under an applied field.
- Ohm's law & resistance
- V = IR for ohmic conductors; resistance R = ρL/A depends on the material's resistivity, length and area.
- Resistor combinations
- In series resistances add; in parallel reciprocals add (the opposite of capacitors).
- EMF & internal resistance
- A real cell has emf ε and internal resistance r; terminal voltage V = ε − Ir.
- Kirchhoff's laws
- Junction rule (charge conservation: ΣI = 0) and loop rule (energy conservation: ΣV = 0); the Wheatstone bridge balances when P/Q = R/S.
Key formulas — Current Electricity
💡 Exam tips for Current Electricity
- Resistors add in series and reciprocate in parallel — the reverse of capacitors.
- Apply Kirchhoff's junction rule (ΣI=0) and loop rule (ΣV=0) consistently with sign conventions.
Sample questions
The SI unit of resistivity (ρ) is:
R = ρL/A ⇒ ρ has units of ohm × metre.
A cell of emf ε and internal resistance r drives current I through external resistance R. The terminal voltage is:
Some emf is dropped across internal resistance; V = ε − Ir.
In a Wheatstone bridge, the bridge is balanced when:
Balance condition: P/Q = R/S (no current through galvanometer).
Current Electricity — FAQs
What are the key concepts in Class 12 Physics Current Electricity?+
This chapter covers electric current, Ohm's law and resistance, combinations of resistors and cells, and Kirchhoff's laws including the Wheatstone bridge. Key ideas include Current & drift velocity, Ohm's law & resistance, Resistor combinations, EMF & internal resistance, Kirchhoff's laws.
What does Class 12 Physics Chapter 3 (Current Electricity) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Current Electricity" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Current Electricity" questions free to practise?+
Yes — sign in with Google to practise "Current Electricity" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Current Electricity" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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