AE Volt Meter Price List w.e.f 1st August 2013 (VIEW)
RISHAB Volt Meter Price List w.e.f 1st August 2013 (VIEW)
Introduction of Voltmeter
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter. Measuring the voltage between two points of an electrical current can be done with an instrument called a voltmeter. One type of voltmeter is a direct-current voltmeter. When taking a voltage reading the instrument is placed across the portion of the circuit that is to be measured.The needle will point to zero on the dial when the voltmeter is not in use. When a current moves through the coil, the magnetic field creates a force on the coil, resulting in needle movement. The force, caused by the electrical current running through the coil and the magnetic field of the magnet, causes the coil to turn. The springs attached to the ends of the coil oppose the coil's motion, which serves to adjust the position of the needle to indicate the correct voltage.Surrounding the cylinder is a rectangular frame with a copper wire coil, with the ends of the wire attached to small spiral springs. Attached to the coil is a needle. The coil carries the electrical current, causing the needle to move. When the needle moves, it points to a reading on a dial which represents voltage.