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

This question requires the use of Ohm's Law to calculate voltage. The formula for Ohm's Law is E = I x R, where E is voltage, I is current in amperes, and R is resistance in ohms. By substituting the given values into the equation, you multiply the current of 2 amperes by the resistance of 10 ohms (2 x 10). This simple multiplication yields a total of 20 volts. The incorrect options are the result of using the wrong mathematical operations. For instance, dividing the resistance by the current gives 5, while dividing the current by the resistance gives 0.2, and adding them yields 12.