Principle of voltmeter introduced by Kunshan voltmeter manufacturer

Traditional pointer voltmeter and ammeter are based on a principle that is the magnetic effect of current. The higher the current

The greater the magnetic force, the greater the swing of the pointer on the voltmeter. There is a magnet and a wire coil in the voltmeter. After passing the current, the coil will produce a magnetic field. After the coil is electrified, it will deflect under the action of the magnet. This is the head part of the ammeter and voltmeter.

Because the voltmeter needs to be connected in parallel with the resistance to be measured, if the sensitive galvanometer is used as the voltmeter directly, the current in the voltmeter will be too large, which will burn the voltmeter. At this time, a large resistance needs to be connected in series in the internal circuit of the voltmeter. After the transformation, when the voltmeter is connected in parallel with the circuit again, due to the effect of resistance, the voltmeter will be damaged, Most of the voltage applied to both ends of the meter is shared by the series resistor, so the current through the meter is actually very small, so it can be used normally.

The symbol of DC voltmeter should be added with a "﹣ V", The symbol of AC voltmeter should add a wave line "~" under v.