Ammeter and Voltmeter readings ?
Answers
Answer:
Ammeter measure the current of a circuit and voltmeter measure the voltage drop across a resistor .It is important in the design and use of these meters that they don't change the circuit in such a way as to influence the readings.
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Answer:
A voltmeter is an instrument that measures the difference in electrical potential between two points in an electric circuit. An analog voltmeter moves a pointer across a scale in proportion to the circuit’s voltage; a digital voltmeter provides a numerical display. Any measurement that can be converted to voltage can be displayed on a meter that is properly calibrated; such measurements include pressure, temperature, and flow.
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Voltmeter: Demonstration voltmeter from a physics class
In order for a voltmeter to measure a device’s voltage, it must be connected in parallel to that device. This is necessary because objects in parallel experience the same potential difference.
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Voltmeter in Parallel: (a) To measure the potential difference in this series circuit, the voltmeter (V) is placed in parallel with the voltage source or either of the resistors. Note that terminal voltage is measured between points a and b. It is not possible to connect the voltmeter directly across the EMF without including its internal resistance, r. (b) A digital voltmeter in use
Ammeters
An ammeter measures the electric current in a circuit. The name is derived from the name for the SI unit for electric current, amperes (A).
In order for an ammeter to measure a device’s current, it must be connected in series to that device. This is necessary because objects in series experience the same current. They must not be connected to a voltage source — ammeters are designed to work under a minimal burden, (which refers to the voltage drop across the ammeter, typically a small fraction of a volt).
Explanation:
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