The area of Physics concerning electricity, electronics and electromagnetism is known as electrical. Electrical formulas play a great role in finding the parameter value in any electrical circuit. The 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

Formulae 

Below are given some commonly used electrical formulas that may be helpful for you.

Solved Problems

Problem 1: The wire is of resistance 5 having current 4 Amperes. Find the potential difference across its ends.

Solution:

Given: Current I = 4 A,

Resistance R = 5

The Potential difference is given by V = IR

= 4 A5

= 20 V

Problem 2: Given that a capacitor has 5mF with applied voltage is 25 V. Find the charge across the capacitor.

Solution:

C= Capacitance of the capacitor = 5 mF

V = Applied voltage = 25 V,

Charge across the capacitor Q = CV

= 5 mF25 V

= 125 10-3 C

= 0.125 C.

 

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