Understanding your calculation
Method, example and limitations
How the calculation works
Ohm’s law relates voltage, current and resistance: V = I × R. Electrical power for a resistive load can be calculated as P = V × I.
Example to check
A 12 V supply across a 6 Ω ideal resistor gives 2 A and dissipates 24 W.
Before using the result
These relationships assume the selected model applies. AC impedance, temperature, component limits and installation safety require more than this calculation.