What formula is used to calculate voltage in a circuit?

Ohm's Law states that voltage (E) equals current (I) multiplied by resistance (R). This fundamental principle describes the relationship between the three main electrical quantities in a direct current circuit. A helpful way to remember this is by using the 'Ohm's Law triangle' with E placed at the top and I and R at the bottom. To find the formula for E, you cover it up and are left with I multiplied by R side-by-side. Distractors that suggest dividing, adding, or subtracting current and resistance do not represent the correct mathematical relationship for calculating voltage.