Electrical is the branch of Physics dealing with electricity, electronics and electromagnetism. Electrical formulas play a great role in finding the parameter value in any electrical circuits. Most commonly used electrical formulas are formulas related to voltage, current, power, resistance etc.
Volt is a unit of electrical potential or motive force – the potential is required to send one ampere of current through one ohm of resistance. Watt is a unit of electrical energy or power – one watt is the product of one ampere and one volt – one ampere of current flowing under the force of one volt gives one watt of energy
Below are given some commonly used electrical formulas which may be helpful for you.
| Quantity | Formula | Unit |
| Charge | Q = C \(\begin{array}{l}\times\end{array} \) V |
Coulomb (C) |
| Capacitance | C = \(\begin{array}{l}\frac{Q}{V}\end{array} \) |
Farad (F) |
| Inductance | VL = – L \(\begin{array}{l}\frac{di}{dt}\end{array} \) |
Henry (L or H) |
| Voltage | V = I R | Volt (V) |
| Current | I = \(\begin{array}{l}\frac{V}{R}\end{array} \) |
Ampere (A) |
| Resistance | R = \(\begin{array}{l}\frac{V}{I}\end{array} \) |
ohm ( \(\begin{array}{l}\omega\end{array} \) ) |
| Power | P = VI | Watt (W) |
| Conductance | G = \(\begin{array}{l}\frac{1}{R}\end{array} \) |
mho ( \(\begin{array}{l}mho\end{array} \) ) |
| Impedance | Z2 = R2 + (xL – xc)2
|
ohm ( \(\begin{array}{l}\omega\end{array} \) ) |
| Resonant Frequency | f = \(\begin{array}{l}\frac{1}{2 \pi \sqrt{LC}}\end{array} \) |
Hertz (Hz) |
Electrical Formulas helps us to calculate the parameters related to electricals in any electrical components.
Solved Examples
Example 1: A wire carrying a current of 4 Amperes is having a resistance of 5
Solution:
Given: Current I = 4 A,
Resistance R = 5
= 4 A
Example 2: Calculate the charge across the capacitor 5mF and the voltage applied is 25 V.
Solution:
Given: Capacitance of the capacitor C = 5 mF,
Voltage applied V = 25 V,
The Charge across the capacitor is given by Q = CV
= 5 mF
= 125
= 0.125 C.
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