What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

To find the voltage across a resistor when the current flowing through it is known, Ohm's Law is applied, which states that voltage (V) equals current (I) multiplied by resistance (R). In this case, the resistance is 2 ohms, and the current is 0.5 amperes.

Using Ohm's Law:

V = I × R

V = 0.5 A × 2 Ω

V = 1 volt

Thus, the voltage across the 2-ohm resistor is indeed 1 volt. This understanding of Ohm's Law is a fundamental concept in electronics and is crucial for any calculations involving resistors and current flow in circuits.