Electric Current Through Conductors
Maharashtra Board · Class 11 · Physics
Quick revision notes for Electric Current Through Conductors — Maharashtra Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Electric Current and Drift Velocity
- Electric current is defined as the amount of charge flowing per unit time through a cross-section
- Current I = Q/t, where Q is charge and t is time
- SI unit of current is Ampere (A)
Ohm's Law and Resistance
- Ohm's law: Current through a conductor is directly proportional to potential difference across it
- V = IR, where R is resistance of the conductor
- Resistance is the property of a conductor to oppose current flow
Resistivity and Temperature Dependence
- Resistivity is intrinsic property of material, independent of shape and size
- Unit of resistivity: Ωm
- Conductivity σ = 1/ρ, unit: S/m
Combination of Resistors
- Series combination: Same current flows through all resistors, voltages add up
- Parallel combination: Same voltage across all resistors, currents add up
- Series: Rs = R₁ + R₂ + R₃ + ..., equivalent resistance increases
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