What is the purpose of using four-terminal connections when measuring low resistance?

To eliminate the effects of contact resistance.

Which method is used for measuring low resistances in the range of 0.1 µΩ to 1.0 Ω?

Kelvin’s Double Bridge Method.

Riddle: I consist of two coils, one for current and one for voltage, and help measure low resistances. What am I?

Ducter Ohmmeter.

True or False: The Ammeter-Voltmeter method is suitable for measuring resistances greater than 100 kΩ.

False. It is primarily used for medium resistances between 1 Ω and 100 kΩ.

Fill in the blank: The ______ method utilizes a constant EMF source to determine unknown resistance by substitution.

Substitution Method

What is the primary challenge when measuring high resistances greater than 100 kΩ?

Leakage current becomes comparable to measuring current, causing errors.

Which method uses a generator and is specifically designed for measuring insulation resistance?

Megger.

Which bridge method employs a guard circuit to mitigate leakage currents?

Megohm Bridge Method.

Fill in the blank: The ______ method involves varying a standard resistance to achieve null deflection in a galvanometer.

Wheatstone Bridge Method

What does a balanced Wheatstone bridge indicate regarding the potential at points c and d?

The potential at points c and d is the same.

True or False: The Loss of Charge Method assumes no capacitance in the circuit.

True.

What is the range of resistance that the Ducter Ohmmeter is useful for?

100 µΩ to 5 Ω.

Riddle: I am a method that measures insulation resistance and often involves a hand-driven generator. What am I?

Megger.

Which method requires the ammeter to read the same current by adjusting a standard resistance?

Substitution Method.

Fill in the blank: The ______ method is designed to measure the insulation resistance of a dielectric.

Megger

Which resistance measurement method is specifically tailored for high resistances and includes a capacitor in the analysis?

Loss of Charge Method.

What principle does a Wheatstone bridge operate on to determine unknown resistance?

Null detection principle.

True or False: The ammeter-Voltmeter method is the most accurate for very high resistances.

False. It is less accurate for very high resistances compared to other methods.

What is the main function of the guard circuit in resistance measurement?

To bypass leakage current and measure only the true resistive current.

What is the primary method used to measure low resistance values in the range of 0.1 µΩ to 1.0 Ω?

Kelvin’s Double Bridge Method