Chapter: 12, Electricity, Formula
| Name | Symbol | Formula | S.I. Unit |
| Charge | Q | Q = ne | Coulomb |
| Current | I | I = Q/t | Amperes |
| Potential difference | V | V = W/Q | Volt (J/C) |
| Resistance | R | R = ρ (L/A) | Ohm (Ω) |
| Resistivity or Specific resistance | ρ | ρ= R(A/L) | Ohm m (Ω m) |
| Conductivity | σ | σ = 1/ρ | mho m-1 (Siemens per meter) |
| Heat | H | VIt or I2RT | Joule (J) |
| Power | P | P = VI or I2R or V2/R | Watt |
| Series Combination of Resistance | R = R1 + R2 +……+Rn | ||
| Parallel Combination of Resistance | 1/R = 1/R1 + 1/R2 +…+1/Rn | ||
| Ohm’s Law | V = IR | ||
| Charge of electron(e) and proton(p) | 1.6 X 10-19 C | ||
| Mass of electron(e) | 9.1 X 10-31 kg | ||
| Mass of proton and neutron | 1.67 X 10-27 kg |
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