Ohm’s Law: The Equation That Powers Circuits

Ohm’s Law links voltage (V), current (I), and resistance (R) in the simple formula 𝑉=𝐼×𝑅.
Voltage is the push, current is the flow, and resistance is the opposition in a circuit.
Increase voltage with constant resistance, and current rises too.
Increase resistance with constant voltage, and current drops.
Ohm’s Law helps engineers design safe, efficient electrical systems.
Light dimmers and volume knobs work by changing resistance and current.
The law is named after Georg Simon Ohm, who discovered it in 1827.
Ohm’s triangle is a handy shortcut: cover one variable to see the equation for the others.
Real-world circuits don’t always follow Ohm’s Law perfectly—especially at high frequencies or in semiconductors.
From phone chargers to power grids, Ohm’s Law is the backbone of electrical design.