brief introduction： Voltmeter is a voltage measurement instrument, commonly used voltmeter voltmeter symbol for "V". There is a permanent magnet in the sensitive galvanometer. A wire coil is connected in series between the two terminals of the galvanometer. The coil is placed in the magnetic field of the permanent magnet and is connected to the meter pointer by a transmission device. Most voltmeters have two ranges. A voltmeter has three terminals, a negative terminal and two positive terminals. T

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