Basic Electronics Formulas
Basic electronics formulas are the foundation of every circuit you will ever analyse, from Ohm’s Law to power dissipation and divider networks. These calculators let you solve for any unknown by entering the values you already know. Use them for quick bench checks, homework, or sizing components in a new design.
Basic Electronics Formula Calculators
- Ohm's Law V = I × R
- Electrical Power P = V × I
- Voltage Divider Vout = Vin × R2 / (R1 + R2)
- Current Divider I1 = Itotal × R2 / (R1 + R2)
- Thévenin Equivalent Rth = Voc / Isc
- Norton Equivalent Rn = Voc / Isc
- Temperature Coefficient of Resistance R(T) = Rref × (1 + α × ΔT)
- Kirchhoff's Voltage Law (KVL) ΣV = V₁ + V₂ + V₃ + ... = 0
- Kirchhoff's Current Law (KCL) ΣI = I₁ + I₂ + I₃ + ... = 0
- Parallel Plate Capacitor C = ε₀ × εr × A / d
- Conductance G = 1 / R
- Millman’s Theorem (3 Branches) V = Σ(Ei/Ri) / Σ(1/Ri)
- Maximum Power Transfer Pmax = Vth² / (4 · Rth)
- Period from Frequency T = 1 / f
Related Formula Categories
Browse the full formulas index for all 32 categories.