How do you determine the current in a circuit when you know the voltage and resistance?

To determine the current in a circuit when the voltage and resistance are known, you can use Ohm's Law, which is a fundamental principle in electrical engineering. Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. This relationship is mathematically expressed as:

I = V / R

In this equation, current is expressed in amperes (A), voltage in volts (V), and resistance in ohms (Ω). By rearranging the formula, when you divide the voltage by the resistance, you can calculate the current flowing through the circuit.

Other options do not correctly represent the relationship defined by Ohm's Law. For instance, multiplying voltage by resistance does not yield current and would result in units that do not correspond to the electric current. Subtracting resistance from voltage also does not yield a meaningful result regarding current, and dividing resistance by voltage results in a value that does not correctly reflect the measurement of current. Understanding these principles is vital for analyzing electrical circuits accurately.