Ohm's Law

Ohm's Law is an equation used in electronics. It was discovered by Georg Ohm in 1827.

The equation:
V = I * R

The variables:

• V is voltage, measured in volts.
  
• I is current, measured in amperes or "amps".
  
• R is resistance, measured in ohms.
  

Solving for I, Ohm's Law can be rewritten as:
I = V / R

Solving for R it is:
R = V / I

Sometimes the letter E is used to represent voltage. In this case the equation is E = I * R.