3.18 Table of various Quantities - Current Electricity - Class 12 Physics
Submitted by superadmin on Sat, 30/08/2025 - 15:04
3.18 TABLE of various quantities:
3.18 TABLE of various quantities:
| Physical Quantity | Symbol | Dimensions | Unit | Remark |
|---|---|---|---|---|
| Electric current | I | [A] | A | SI base unit |
| Charge | Q, q | [T A] | C | |
| Voltage, Electric potential difference | V | [M L^2 T^−3 A^−1] | V | Work/charge |
| Electromotive force | ε | [M L^2 T^−3 A^−1] | V | Work/charge |
| Resistance | R | [M L^2 T^−3 A^−2] | Ω | R = V/I |
| Resistivity | ρ | [M L^3 T^−3 A^−2] | Ω m | R = ρl/A |
| Electrical conductivity | σ | [M^−1 L^−3 T^3 A^2] | S | σ = 1/ρ |
| Electric field | E vector | [M L T^−3 A^−1] | V m^−1 Electric force/ charge | |
| Drift speed | Vd | [L T^−1] | m s^−1 | vd = e E τ /m |
| Relaxation time | τ | [T] | s | |
| Current density | j vector | [L^−2 A] | A m^−2 | current/area |
| Mobility | μ | [M L^3 T^−4 A^-1] | m^2V^−1s^−1 | vd /E |