Current Electricity
Class 12 · Current Electricity

Ohm's Law (Animated)

V = IR with animated electron flow whose density scales with I.

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Key Notes

01

Ohm's law: V = IR — applies only to ohmic materials at constant temperature.

02

I is rate of charge flow; one ampere = one coulomb per second.

03

Power dissipated: P = VI = I²R = V²/R.

Formulas

Ohm's law

Linear V-I relation for ohmic devices.

Power

Three equivalent forms.

Important Points

Diodes, bulbs (with hot filament), and electrolytes are NOT ohmic.

R depends on temperature: R(T) = R₀(1 + αΔT) for metals.

Ohm's Law (Animated) notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 12 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.