Which symbol denotes the unit of electrical resistance?

Which symbol denotes the unit of electrical resistance?

• A. Ω
• B. A
• C. V
• D. W

Answer: (A)

Ω denotes the ohm, the unit of electrical resistance. Resistance measures how much a component opposes current flow; in Ohm’s law, it’s the ratio of voltage to current (R = V / I). The ohm is defined so that a one-volt potential difference driving a one-ampere current corresponds to one ohm. In circuits, higher resistance means less current for the same voltage. The other symbols represent different quantities: ampere for current, volt for voltage, and watt for power.

Ω denotes the ohm, the unit of electrical resistance. Resistance measures how much a component opposes current flow; in Ohm’s law, it’s the ratio of voltage to current (R = V / I). The ohm is defined so that a one-volt potential difference driving a one-ampere current corresponds to one ohm. In circuits, higher resistance means less current for the same voltage. The other symbols represent different quantities: ampere for current, volt for voltage, and watt for power.