EVT F4 Electrical Systems And Components Practice Test

Ohm's Law shows how voltage, current, and resistance are connected in a circuit. It states that the voltage across a conductor equals the current through it times its resistance, written as V = IR. From this, you can see the three quantities involved: voltage, current, and resistance. You can also rearrange it to I = V/R or R = V/I, so any one of the three can be found if the other two are known. This relationship holds well for ohmic devices where resistance stays essentially constant as voltage or current changes. Other listed laws describe different ideas: Kirchhoff's laws deal with how currents and voltages sum around a circuit, Faraday's law relates changing magnetic flux to induced voltage, and Poynting's theorem describes how energy flows in electromagnetic fields. They aren’t the direct link among the three quantities that Ohm's Law provides.