The correct answer is C. both (A) and (B).
Instrument transformers are used to measure and control electrical quantities such as voltage, current, and power. They are used in a variety of applications, including power generation, transmission, and distribution.
Potential transformers (PTs) are used to measure voltage. They work by stepping down the voltage from a high level to a lower level that can be safely measured by instruments.
Current transformers (CTs) are used to measure current. They work by stepping down the current from a high level to a lower level that can be safely measured by instruments.
Power transformers are used to transfer power from one circuit to another. They work by stepping up or down the voltage and current.
Here is a brief explanation of each option:
- Option A: Potential transformers (PTs) are used to measure voltage. They work by stepping down the voltage from a high level to a lower level that can be safely measured by instruments.
- Option B: Current transformers (CTs) are used to measure current. They work by stepping down the current from a high level to a lower level that can be safely measured by instruments.
- Option C: Both (A) and (B) are correct. Instrument transformers can be used to measure both voltage and current.
- Option D: Power transformers are used to transfer power from one circuit to another. They work by stepping up or down the voltage and current.