Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
An ammeter is an instrument used to measure the electric current flowing through a circuit. It tells us how many charges are passing through it per unit time.
A voltmeter is an instrument used to measure the potential difference or voltage across two points in a circuit. It measures how much electrical energy is being transferred between those points.
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to its resistance.