Physics
Basic
Ohm's Law
Voltage equals current times resistance.
Formula
Variables
VVoltage (V)
ICurrent (A)
RResistance (Ω)
Example
A 12 V battery across a 4 Ω resistor drives I = 12/4 = 3 A.
Did You Know?
Georg Ohm was initially ridiculed for his law; today it's the first equation every electronics student learns.