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ASVAB · Physics

What is the unit of electrical resistance?

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Correct answer

Ohm

  1. A Volt
  2. B Watt
  3. C Ohm
  4. D Ampere

Why this is the answer

The Ohm (Ω) is the unit of electrical resistance. Ampere = current; Volt = voltage; Watt = power. A useful way to keep the four straight: the volt pushes, the ampere flows, the ohm resists, and the watt is the rate at which energy is used (volts × amperes). The symbol Ω (omega) is used for ohms on circuit diagrams and multimeters. Resistance is what limits current for a given voltage, per Ohm's Law (V = IR).
Source: ASVAB GS, Electricity

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About this topic: Physics

Physics questions cover motion, forces, Newton's laws, energy, heat, sound, light and basic electricity. Units and simple relationships (speed = distance ÷ time, F = ma) are tested more than calculation. This is one of 15 General Science questions on physics, each with a full explanation on a single study page.

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