Current Electricity - Kirchhoff's Laws, Wheatstone Bridge
Physics · Grade 12 · Week 9 · 25 questions
In CBSE Grade 12 physics, Current Electricity is a heavyweight chapter dealing with Kirchhoff's Laws and Wheatstone Bridge. Expect at least one long-answer (5-mark) question from this chapter on the board paper almost every year.
What you'll practise
- State and apply Kirchhoff's Laws
- Derive Wheatstone Bridge
- Solve CBSE board-pattern problems from current electricity including NCERT exemplar-level questions
All 25 questions in this Current Electricity - Kirchhoff's Laws, Wheatstone Bridge quiz
Grade 12 Physics — Current Electricity - Kirchhoff's Laws, Wheatstone Bridge: 25 practice questions with instant scoring and explanations.
- Kirchhoff's junction rule (current law) states:
- Junction rule is based on:
- Kirchhoff's loop rule (voltage law):
- Loop rule is based on:
- For Wheatstone bridge balance: P/Q = :
- At bridge balance, galvanometer current = :
- Wheatstone bridge is used to measure:
- Meter bridge is based on:
- In a meter bridge, balance condition: l₁/l₂ = :
- Potentiometer is used to measure:
- At null point on potentiometer, current from cell is:
- Potential gradient of potentiometer wire:
- Potentiometer vs voltmeter:
- In a Wheatstone bridge with P=3, Q=6, R=9, balanced S = :
- Heat generated in resistor (Joule's law): H = :
- Electric energy (kWh): 1 unit = :
- Two resistors 6 Ω and 12 Ω in parallel:
- EMF of cell with terminal V = 1.4 V, current 0.2 A, r = 0.5 Ω: EMF = :
- Galvanometer can be converted to ammeter by:
- Galvanometer converted to voltmeter by:
- Ideal ammeter has:
- Ideal voltmeter has:
- A 100 W bulb at 220 V running for 5 h uses energy:
- Internal resistance of typical AA battery ≈ :
- Grouping cells of EMF ε and internal r: n cells in series give terminal V (no load):
Question 1 of 250 correct so far