Electro-Magnetic Induction Effect

Electro-Magnetic Induction Effect Points : Electro-Magnetic Induction Effect When a non-magnetic conducting pivoted disc or a drum is placed in a magnetic field produced by a system of electromagnets excited by alternating current, an emf is induced in the disc or drum. If a closed path is provided, the emf forces a current to flow in the disc or drum. The force produced by the interaction of induced currents and the alternating magnetic fields makes the disc. The induction effect is mainly utilized for a.c. energy meters. Chemical Effect According to this effect when electric current is passed through an electrolyte, a chemical action starts up. Using this electro-chemical action of current, D.C. Ampere-hour meters are constructed. However due to their high cost and other complications these instruments arc not commonly used.
According to Faraday’s law when current is passed through an electrolyte, a chemical action starts up (decomposition of electrolyte takes place). With the result of this decomposition, a metal from the electrolyte starts depositing on one of the electrodes. According to said law the amount of decomposition of metal from electrolyte is directly proportional the product of current and time (i.e. the amount of energy consumed in this process). This principle can he utilized by a D.C. ampere-hour meter or electrolytic meter for measurement of energy in d.c. circuit.