Ohm's Law

Electrical energy is governed by several basic laws. The first, Ohm's law, is similar to the Lohm law and defines the resistance of a device to the flow of electrons.

V = I x R V = electric potential (volts)
I = current (amperes)
R = resistance (ohms)

When current passes through a resistance, power is dissipated in the form of heat, as in an oven. Power is calculated by the following:

P = V x I P = power (watts)

These equations allow any one of the four electrical parameters to be expressed in terms of any other two. A reference table of derived expressions is given below.

Swipe to the right for more table information

DC ELECTRICAL EQUATIONS
VOLTAGE CURRENT RESISTANCE POWER

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