Question

What are the advantages and disadvantages of Dynamometer wattmeter? Write the different types of Dynamometer wattmeters.

Hint:

Dynamometer wattmeters measure true power in both AC and DC circuits using the interaction of magnetic fields.

Answer 1

Advantages of Dynamometer Wattmeter:
It can measure both AC and DC power accurately.
It has a wide range of frequency response.
It is independent of power factor, so it measures true power.
It is very sensitive and can measure low power levels. Disadvantages of Dynamometer Wattmeter:
It is expensive compared to other wattmeters.
It has friction losses due to moving parts which can affect accuracy.
It is fragile and needs careful handling.
It requires regular maintenance. Types of Dynamometer Wattmeters:
Single-phase Dynamometer Wattmeter
Polyphase Dynamometer Wattmeter
Portable Dynamometer Wattmeter