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Question:

What is the principle of measuring resistance and current with digital multimeter?

What is the principle of measuring resistance and current with digital multimeter?

Answer:

The resistance is usually measured by the proportion method. The measured resistance is connected with the standard resistance in series, and the voltage of the standard resistance and the resistance measured are measured. The current of the two resistors is the same, and the resistance value of the resistance is converted according to the resistance value of the standard resistance. The actual measuring circuit also has the standard resistance corresponding voltage as the reference voltage, so that the voltage at both ends of the tested resistor can be measured directly.
Measuring current is known as the resistance value of sampling resistance, measuring voltage, according to Ohm theorem to find current.
Measurement of resistance and current is achieved by measuring voltage.

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