Ohm's Law

Ohm's Law describes the relationship between current (II), voltage (VV), and resistance (RR), so that current, which is the flow of electricity, is defined as:

I=V/RI = V/R

Given the values for any two variables, we solve for the third, so that voltage, electrical potential energy, is defined as:


And resistance, which impedes the flow of electricity, is:

R=V/IR = V/I

Conductance (GG), which is the ability for a material to conduct electricity is defined as the inverse of resistance, and can therefore calculated by Ohm's Law as:

G=I/VG = I/V

Video: Circuits and Ohm's Law


Ohm's Law is named after Georg Simon Ohm, who first derived the relationships now known as Ohm's Law.

Deeper Knowledge on Ohm's Law

Electrical Circuits

Ways of assembling electronic elements

Broader Topics Related to Ohm's Law

Conductance and Siemens

The ability to conduct to current, measured in siemens

Current and Amperes

The flow of electricity, measured in amps


Energy that results from charged particles

Resistance and Ohms

Opposition to current, measured in ohms

Voltage and Volts

Electrical potential energy, measured in volts

Ohm's Law Knowledge Graph