What is the unit of electrical resistance?

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Multiple Choice

What is the unit of electrical resistance?

The concept here is how resistance relates to voltage and current. Resistance is what slows down the flow of charges, and Ohm’s law tells us V = I × R, so R = V / I. Because voltage is measured in volts and current in amperes, the unit of resistance is the ohm (Ω). One ohm means that applying one volt of potential difference produces one ampere of current. For example, if you have 5 V across a component and 2 A flows, the resistance is 5 ÷ 2 = 2.5 Ω. The other two units, volt and ampere, measure potential difference and current respectively, while watt measures power.

The concept here is how resistance relates to voltage and current. Resistance is what slows down the flow of charges, and Ohm’s law tells us V = I × R, so R = V / I. Because voltage is measured in volts and current in amperes, the unit of resistance is the ohm (Ω). One ohm means that applying one volt of potential difference produces one ampere of current. For example, if you have 5 V across a component and 2 A flows, the resistance is 5 ÷ 2 = 2.5 Ω. The other two units, volt and ampere, measure potential difference and current respectively, while watt measures power.

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