Product Introduction:
NM194U-9X4 Voltmeter Current
A voltmeter is an instrument for measuring the voltage. The structure of the voltmeter is: there is a permanent magnet in the sensitive ammeter, and a coil composed of wires is connected in series between the two terminals of the ammeter. The coil is placed in the magnetic field of the permanent magnet, and is connected with the pointer of the meter through the transmission device.
Common voltmeter - voltmeter, voltmeter symbol :V, most voltmeters are divided into two ranges. The voltmeter has three binding post, one negative terminal and two positive terminals, the positive terminal of the voltmeter is connected to the positive terminal of the circuit, and the negative terminal is connected to the negative terminal of the circuit. The voltmeter must be connected in parallel with the electrical appliance under test. A voltmeter is a fairly large resistor, ideally thought of as an open circuit.
Traditional pointer voltmeters and ammeters are based on a principle that is the magnetic effect of current. The greater the current, the greater the magnetic force generated, the greater the pendulum of the pointer on the voltmeter, the greater the pendulum of the voltmeter, the voltmeter has a magnet and a wire coil, through the current, the coil will produce a magnetic field, the coil after the power will be deflected under the action of the magnet, which is the ammeter, the head of the voltmeter.
Because of the voltmeter and measured resistance in parallel, so if the sensitive ammeter is directly used when the voltmeter is used, the current in the meter is too large, it will burn the meter, then it is necessary to series a large resistance in the internal circuit of the voltmeter, so that after the transformation, when the voltmeter is connected in parallel in the circuit, due to the role of the resistance, Most of the voltage added to both ends of the meter is shared by this series of resistors, so the current through the meter is actually very small, so it can be used normally.
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