What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

The voltage across a resistor can be determined using Ohm's Law, which states that voltage (V) is equal to the current (I) flowing through the resistor multiplied by the resistance (R) of the resistor. The formula is expressed as:

V = I × R

In this scenario, we have a resistor with a resistance of 10 ohms and a current of 2 amperes flowing through it. Substituting these values into the formula yields:

V = 2 A × 10 Ω = 20 volts.

Thus, the voltage across the 10-ohm resistor is 20 volts. This application of Ohm's Law is fundamental in electrical theory and is crucial for understanding how voltage, current, and resistance interact in a circuit.