Which of the following measures insulation resistance in millions of ohms?

Which of the following measures insulation resistance in millions of ohms?

• A. Frequency meter
• B. Wattmeter
• C. Megger
• D. Oscilloscope

Answer: (C)

The correct answer is the Megger, which is specifically designed to measure insulation resistance. Insulation resistance is crucial for ensuring the safety and reliability of electrical systems, allowing technicians to assess the integrity of insulating materials that separate conductive parts from each other or from the ground. A Megger operates by applying a high-voltage, low-current signal across the insulation being tested. The resulting current flow, or lack thereof, provides a measurement of insulation resistance expressed in megohms (millions of ohms). High resistance indicates that the insulation is in good condition, while low resistance suggests potential leakage or failure that could lead to short circuits or electrical shocks. Devices like frequency meters, wattmeters, and oscilloscopes serve different purposes in electrical measurements. Frequency meters measure the frequency of an AC signal, wattmeters measure the power in watts flowing through a circuit, and oscilloscopes visualize the waveform of electrical signals. None of these instruments are equipped to specifically measure insulation resistance, which makes the Megger the appropriate choice for this application.

The correct answer is the Megger, which is specifically designed to measure insulation resistance. Insulation resistance is crucial for ensuring the safety and reliability of electrical systems, allowing technicians to assess the integrity of insulating materials that separate conductive parts from each other or from the ground.

A Megger operates by applying a high-voltage, low-current signal across the insulation being tested. The resulting current flow, or lack thereof, provides a measurement of insulation resistance expressed in megohms (millions of ohms). High resistance indicates that the insulation is in good condition, while low resistance suggests potential leakage or failure that could lead to short circuits or electrical shocks.

Devices like frequency meters, wattmeters, and oscilloscopes serve different purposes in electrical measurements. Frequency meters measure the frequency of an AC signal, wattmeters measure the power in watts flowing through a circuit, and oscilloscopes visualize the waveform of electrical signals. None of these instruments are equipped to specifically measure insulation resistance, which makes the Megger the appropriate choice for this application.