What is the formula for resistance?

What is the formula for resistance?

• A. Resistance = Current/Potential difference
• B. Resistance = Potential difference/Current
• C. Resistance = Power/Current
• D. Resistance = Voltage*Current

Answer: (B)

Resistance is the opposition to current described by Ohm’s law. The relationship V = IR means the ratio of voltage to current gives the resistance, so R = V / I. In words, resistance is voltage per current, which matches the unit ohm (volt per ampere). This is why the correct form uses potential difference divided by current. The other forms mix up the quantities: I/V would give conductance, P/I would give voltage, and V × I gives power, not resistance.

Resistance is the opposition to current described by Ohm’s law. The relationship V = IR means the ratio of voltage to current gives the resistance, so R = V / I. In words, resistance is voltage per current, which matches the unit ohm (volt per ampere).

This is why the correct form uses potential difference divided by current. The other forms mix up the quantities: I/V would give conductance, P/I would give voltage, and V × I gives power, not resistance.