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Current electricity formulas
16 formulas for Current electricity, from the Physics — Formulas section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Current | I = Q/t = nAev_d 🧮 Solve step by step | A |
| Ohm's law | V = IR 🧮 Solve step by step | |
| Resistance | R = ρL/A 🧮 Solve step by step | Ω |
| Temperature dependence | R_T = R₀(1 + αΔT) 🧮 Solve step by step | |
| Resistors in series | R = R₁ + R₂ + … | |
| Resistors in parallel | 1/R = 1/R₁ + 1/R₂ + … | |
| Electric power | P = VI = I²R = V²/R 🧮 Solve step by step | W |
| Electrical energy | E = Pt 🧮 Solve step by step | J or kWh |
| EMF & internal resistance | V = E − Ir 🧮 Solve step by step | |
| Kirchhoff's current law | ΣI = 0 at a junction | |
| Kirchhoff's voltage law | ΣV = 0 around a loop | |
| Wheatstone bridge (balanced) | P/Q = R/S 🧮 Solve step by step | |
| Meter bridge | R/S = l/(100 − l) 🧮 Solve step by step | |
| Cells in series / parallel | E_eq = ΣE / E_eq = E (identical cells) | |
| Joule heating | H = I²Rt 🧮 Solve step by step | J |
| Drift velocity | v_d = eEτ/m 🧮 Solve step by step |
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