Current Electricity - Ohm's Law, Drift Velocity
Physics · Grade 12 · Week 7 · 25 questions
In CBSE Grade 12 physics, Current Electricity is a heavyweight chapter dealing with Ohm's Law and Drift Velocity. 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 Ohm's Law
- Calculate Drift Velocity
- Solve CBSE board-pattern problems from current electricity including NCERT exemplar-level questions
All 25 questions in this Current Electricity - Ohm's Law, Drift Velocity quiz
Grade 12 Physics — Current Electricity - Ohm's Law, Drift Velocity: 25 practice questions with instant scoring and explanations.
- Electric current is defined as:
- SI unit of current:
- 1 A = :
- Ohm's law: V = :
- SI unit of resistance:
- 1 Ω = :
- Ohm's law is obeyed by:
- Current direction (conventional) is:
- Drift velocity: v_d = :
- n in drift velocity formula is:
- Drift velocity in typical copper wire is approximately:
- Mobility μ = :
- SI unit of mobility:
- Current density J = :
- J vector relates to E: J = :
- SI unit of conductivity:
- Resistance R of uniform wire = :
- ρ (resistivity) SI unit:
- Conductivity σ = :
- If length of wire doubles (same A), resistance:
- If cross-section area doubles (same L), resistance:
- Temperature coefficient of resistance α is positive for:
- For semiconductors, resistance with temperature:
- For superconductors below T_c, resistance is:
- Power dissipated in resistor: P = :
Question 1 of 250 correct so far