Ammeter
Definition
An ammeter is an instrument used to measure the electric current in a circuit. It is typically connected in series with the circuit whose current is being measured.
5 Must Know Facts For Your Next Test
- Ammeters are designed to have very low internal resistance to minimize the voltage drop across them.
- Ammeter readings are typically given in amperes (A), milliamperes (mA), or microamperes ($\mu$A).
- For accurate measurements, ammeters should be connected in series with the load.
- Using an ammeter incorrectly, such as connecting it in parallel, can cause damage to both the instrument and the circuit.
- Digital ammeters provide a numerical display of current, while analog ammeters use a needle to indicate current on a scale.
Review Questions
- Why must an ammeter be connected in series with the load for accurate measurement?
- What could happen if an ammeter is mistakenly connected in parallel with a circuit element?
- How does the internal resistance of an ammeter affect its operation and measurement accuracy?
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Related terms
Voltmeter: An instrument used for measuring electrical potential difference between two points in a circuit. It is connected in parallel with the component whose voltage is being measured.
Ohmmeter: A device used to measure electrical resistance within a circuit. It often combines functions of other meters and uses its own power source.
Multimeter: An electronic measuring instrument that combines several measurement functions in one unit, commonly measuring voltage, current, and resistance.
