14. Mr. Mehta notes down the readings of electricity meters in houses to prepare electricity bills. Shown below is Mrs. Sheth's electricity meter. Which of these is the correct reading that Mr. Mehta should note down? ows A. 29.56 kilowatt-hours B. B. 295.06 kilowatt-hours C. C. 295.6 kilowatt-hours D. D. 2956 kilowatt-hours 用。 02956
Answers
Step-by-step explanation:
As commercial use of electric energy spread in the 1880s, it became increasingly important that an electric energy meter, similar to the then existing gas meters, was required to properly bill customers, instead of billing for a fixed number of lamps per month.
DC meters measured charge in ampere hours. Since the voltage of the supply should remain substantially constant, the reading of the meter was proportional to actual energy consumed. For example, if a meter recorded that 100 ampere hours had been consumed on a 200-volt supply, then 20 kilowatt-hours of energy had been supplied.
Many experimental types of meter were developed. Thomas Edison at first worked on a direct current (DC) electromechanical meter with a direct reading register, but instead developed an electrochemical metering system, which used an electrolytic cell to totalise current consumption. At periodic intervals the plates were removed and weighed, and the customer billed. The electrochemical meter was labor-intensive to read and not well received by customers.