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

Calculating the voltage across a component is done using Ohm's Law, which is expressed mathematically as E = I x R. E is the voltage, I is the current, and R is the resistance. When you apply the given values to the equation, you multiply the current of 2 amperes by the resistance of 10 ohms. This simple multiplication (2 x 10) yields 20 volts. Watch out for the incorrect options that use basic arithmetic incorrectly instead of the proper formula. Dividing 2 by 10 gives 0.2, adding them gives 12, and subtracting gives 8, none of which are the correct way to find voltage.