Electrical formulas

Electric Light Bulb

Electric Light Bulb

There are a lot of electrical formulas that are used to describe electrical processes. Some of them are common, basic formulas that are included in the programs of high or secondary schools, while other electrical formulas are more complex and are a part of professional engineers’ competence.

Basic electrical Units used in formulas:

Ampere is a unit of current. It means that ampere is used to describe how much a volt can send through an Ohm.

Volt is the potential of electricity. In other words, it is the motive force. Volt is vital for the process of ampere sending through an Ohm, as the Ohm represents resistance and the Ampere is current.

Ohm can be described as a united of resistance. When an ampere is impelled by a volt, the Ohm represents the quantity of resistance of the passage between the ampere and the volt.

Watt stands for the energy or the power of electricity. The Watt is a result of an Ampere and a Volt. The Ampere is flowing through the force of a Volt and so it makes a Watt filled with energy or power.

The Volt Ampere is a result of multiple amperes and volts that are shown by special tools like ammeter and voltmeter. The Volt Ampere is usually equal to the Watts, in other words, to the power delivered. In alternative systems of currents it might be a different case – the amperes and volts could have different quantities ant thus it might not be synchronous. Power Factor stands for the ratio between the watts and volt amperes. Kilovolt Ampere has equality with a thousand Volt Amperes.

In the formulas below, the letter P stand for Power (Watts), the letter V stand for Voltage (Volts), I is the current (Amperes) and R is resistance (Ohms).

Main Electric Power Formulas

  • P = V I (1a)
  • P = R I2 (1b)
  • P = V2/ R (1c)

Main Electric Current Formulas

  • I = V / R (2a)
  • I = P / V (2b)
  • I = (P / R)1/2 (2c)

Main Electric Resistance Formulas

  • R = V / I (3a)
  • R = V2/ P (3b)
  • R = P / I2 (3c)

Main Electrical Potential Formulas by Ohms Law

Ohms law can be described as:

  • V = R I (4a)
  • V = P / I (4b)
  • V = (P R)1/2 (4c)

An example of Ohms Law

A 12 volt battery enables power to a resistance of 18 Ohm.

I = 12 (Volts) / 18 (ohms)

= 0.67 (Ampere)


These are the main types of units used in engineering and physics. The Ohms law is extremely important for the development of electricity and modern technology as these are considered as the base. Some of these electrical formulas are being taught in secondary and high schools, while the more complex ones are only being taught on a professional level – in universities, exclusively in programs of physics and engineering.

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