Which equation correctly expresses Ohm's law relating voltage, current, and resistance?

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Multiple Choice

Which equation correctly expresses Ohm's law relating voltage, current, and resistance?

Voltage, current, and resistance follow Ohm's law: the voltage across a conductor equals the current through it multiplied by its resistance. This direct form, V = IR, shows exactly how the three quantities relate: if you know any two, you can find the third. The units line up too: volt = ampere × ohm. The other algebraic forms, R = V/I and I = V/R, are just rearrangements of the same rule and are also valid, but V = IR is the simplest way to express the direct link among voltage, current, and resistance. The power relation P = VI is related but describes electrical power, not the three-way relationship itself. For example, a 2-ohm resistor with 3 amperes has V = IR = 2 × 3 = 6 volts.

Voltage, current, and resistance follow Ohm's law: the voltage across a conductor equals the current through it multiplied by its resistance. This direct form, V = IR, shows exactly how the three quantities relate: if you know any two, you can find the third. The units line up too: volt = ampere × ohm. The other algebraic forms, R = V/I and I = V/R, are just rearrangements of the same rule and are also valid, but V = IR is the simplest way to express the direct link among voltage, current, and resistance. The power relation P = VI is related but describes electrical power, not the three-way relationship itself. For example, a 2-ohm resistor with 3 amperes has V = IR = 2 × 3 = 6 volts.

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