Question
A dynamometer type wattmeter consists of ________.
This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
potential and current coils
Dynamometer Wattmeter Construction
A dynamometer type wattmeter is characterized by its use of two specific types of coils:
- A fixed current coil: This coil has low resistance and is connected in series with the load to measure the current flowing through it.
- A movable potential coil: This coil has high resistance and is connected in parallel across the load to measure the voltage across it.
The interaction between the magnetic fields generated by these two coils allows for the measurement of electrical power. The torque produced is proportional to the product of the voltage across and the current through the load, which represents power.
Therefore, the defining components of a dynamometer wattmeter are its potential and current coils.
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