GeoGebra

What is Ohm's law?

Author:Allen Olson
In physics, one area of study is electric circuits, and Ohm's law relates three key concepts of electric circuits: voltage, current, and resistance. These quantities have standard units of measurement and standard abbreviations when used in formulas:
  • Voltage (V) is measured in volts (V).
  • Current (I) is measured in amps (A).
  • Resistance (R) is measured in ohms ().
Expressed as a formula, Ohm's law can be written as V=IR. In words, the voltage is quantitatively equal to the product of the current times the resistance. This relationship holds true for fairly large ranges of voltage, current, and resistance.

New Resources

Discover Resources

Discover Topics