The correct answer is: C. Resistance
A VTVM, or vacuum tube voltmeter, is a type of voltmeter that uses vacuum tubes to amplify the voltage signal being measured. This makes it possible to measure very small voltages with high accuracy.
VTVMs can be used to measure both AC and DC voltages. They can also be used to measure current, but this is not their primary function.
Resistance is a measure of how difficult it is for current to flow through a material. It is measured in ohms (Ω).
VTVMs cannot be used to measure resistance because they do not have the necessary circuitry to do so.
A VTVM is a versatile instrument that can be used to measure a variety of electrical quantities. However, it is important to understand its limitations so that you can use it effectively.
Here is a brief explanation of each option:
- A. Voltage
A VTVM can be used to measure voltage. In fact, this is its primary function. VTVMs can be used to measure both AC and DC voltages.
- B. Current
A VTVM can be used to measure current, but this is not its primary function. VTVMs can be used to measure AC and DC current.
- D. None of the above
This option is incorrect. A VTVM can be used to measure voltage and current, but it cannot be used to measure resistance.