Which unit measures electrical resistance?

Which unit measures electrical resistance?

• A. Ohm
• B. Volt
• C. Ampere
• D. Amp

Answer: (A)

Resistance is measured in ohms, the unit that quantifies how much a component resists current flow. One ohm corresponds to a voltage of one volt driving a current of one ampere, which is why resistance is defined as R = V / I in Ohm’s law. The volt measures electrical potential difference, the ampere (often shortened to amp) measures current, and the ohm links the two by describing how much current a given voltage will push through a circuit. For example, with 6 volts across a 2-ohm resistor, the current would be 3 amperes (I = V / R = 6 V / 2 Ω = 3 A).

Resistance is measured in ohms, the unit that quantifies how much a component resists current flow. One ohm corresponds to a voltage of one volt driving a current of one ampere, which is why resistance is defined as R = V / I in Ohm’s law. The volt measures electrical potential difference, the ampere (often shortened to amp) measures current, and the ohm links the two by describing how much current a given voltage will push through a circuit. For example, with 6 volts across a 2-ohm resistor, the current would be 3 amperes (I = V / R = 6 V / 2 Ω = 3 A).