1. Comparison of various types of Instruments 2. Comparison between Ammeter and Voltmeter
COMPARISONS
The following table
gives the comparison between PMMC, moving iron and electro dynamometer type
instrument.


Ammeter
1. It is a current
measuring device which measures current through circuit.
2. Always connected in
series with circuit.
3. Power loss is given
by I2Ra were Ra is ammeter resistance.
4. For low power loss,
Ra must be low,
5. Deflecting torque is
produced by current to the voltage to be measured directly.
Voltmeter
1. It is a voltage
measuring device which measures potential difference between any two points of
a circuit.
2. Always connected in
parallel with the circuit.
3. Power loss is given
by V2/Rv where Rv is voltmeter resistance.
4. For low power loss,
Ra must be as high as possible.
5. Deflecting torque is
produced by a current which is proportional to the voltage to be measured.
Basic Electronics and Electrical Engineering: Chapter 6: Measurement and Instrumentation : Tag: Basic Engineering : - Comparisons: various types of Instruments, between Ammeter and Voltmeter
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