Final answer:
Ohm's Law states that the resistance a current faces when flowing through a circuit is quantified in ohms (Ω) and is calculated using the formula V = IR, representing the voltage (V) necessary to drive a current (I) through a given resistance (R).
Step-by-step explanation:
Ohm's Law states that it takes one volt to push one ampere through one ohm of resistance. The relationship is expressed by the equation V = IR, where V is the voltage across the resistor in volts, I is the current through the resistor in amperes, and R is the resistance in ohms (Ω). This fundamental principle in physics describes how voltage, current, and resistance interact within an electrical circuit. An instrument known as an ohmmeter can measure resistance by applying a known voltage, measuring the current, and using Ohm's Law to calculate the resistance.
In practical terms, if you want to create a current of 1 A through a circuit with a resistance of 1 Ω, you would need to apply a voltage of 1 V. The resistance represents the difficulty an electric current faces when flowing through a conductor and it determines the amount of current for a given voltage.