Correct option is A
An electromechanical induction meter, commonly known as a watt-hour meter or an energy meter, is used to measure the amount of electrical energy consumed by a load. The aluminum disc inside the meter rotates at a speed proportional to the power being consumed. This is because the meter generates a magnetic field that induces currents in the disc, causing it to rotate. The speed of rotation is directly related to the product of the voltage and the current (i.e., the power) flowing through the meter. The more power that is consumed, the faster the disc rotates, and the revolutions are counted to determine the total energy consumption.
Explanation of the Options: -
(a) power: This is correct. The speed of the aluminum disc is proportional to the power consumed, which is the product of voltage and current (P = V × I).
(b) resistance: This is incorrect. Resistance does not directly affect the speed of the disc in an induction meter.
(c) current: This is incorrect. While current is a factor in power, the disc's speed is proportional to the overall power, not just the current.
(d) voltage: This is incorrect. While voltage is a factor in power, the disc's speed is proportional to the overall power, not just the voltage.
Therefore, the correct answer is (a) power.
