ELECTRICAL ENGINEERING
Ohm’s law
Voltage, current and resistance are related in a simple resistive circuit.
INTERACTIVE EXAMPLESIMULATION
The principle
For an ohmic resistor, U = I × R. Thus I = U / R and R = U / I. This describes a linear resistance under the given conditions; not all components behave this way.
An example
Adjust voltage and resistance to see the calculated current. For example, 12 V across 6 Ω produces 2 A.
Important
Real circuits also involve power, temperature, tolerances and maximum component ratings.