FCC GROL Element 3 Complete Practice Test 2026

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Which form describes Ohm's law in its simplest form?

V = I / R

V = I R

Voltage across a resistor is equal to the current through it multiplied by its resistance. This direct proportionality shows how V depends on I and R: V = IR. In this form, the relationship is immediately clear—doubling the current or doubling the resistance doubles the voltage, assuming the other quantity stays the same. The units align: volts come from amperes times ohms.

For example, if 2 A flows through a 5 Ω resistor, the voltage across it is 10 V (V = IR = 2 A × 5 Ω = 10 V).

The other expressions are rearrangements or derived results. I = V / R is simply another way to write the same relationship, but the simplest form to remember is V = IR because it directly ties voltage to the product of current and resistance. P = V^2 / R describes power and is derived from Ohm's law, not Ohm's law itself.

I = V / R^2

P = V^2 / R