What is the unit of electrical resistance?

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Build your vocabulary for the IGCSE Coordinated Science Exam. Study with flashcards and multiple choice questions, each with hints and explanations. Prepare for success!

Multiple Choice

What is the unit of electrical resistance?

Explanation:
Resistance measures how much a component slows down the flow of electric current. The unit for that property is the ohm, symbol Ω. This comes from Ohm’s law: V = I × R, so R = V / I. Since voltage is in volts and current in amperes, the unit of resistance is volt per ampere, which is read as ohm. A practical sense: keeping the voltage fixed, increasing resistance lowers the current. For example, with 4 volts across a 2 ohm resistor, the current is 2 amperes. The other units—volt for potential difference, ampere for current, watt for power—describe different quantities. So the unit of electrical resistance is the ohm.

Resistance measures how much a component slows down the flow of electric current. The unit for that property is the ohm, symbol Ω. This comes from Ohm’s law: V = I × R, so R = V / I. Since voltage is in volts and current in amperes, the unit of resistance is volt per ampere, which is read as ohm. A practical sense: keeping the voltage fixed, increasing resistance lowers the current. For example, with 4 volts across a 2 ohm resistor, the current is 2 amperes. The other units—volt for potential difference, ampere for current, watt for power—describe different quantities. So the unit of electrical resistance is the ohm.

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