Question

(a) What do you understand by the units of electrical energy?
(b) How many joules of energy are consumed if the electrical meter shows 200 units of
energy?​

Answer 1

Answer:

Electric Power is the rate at which work is done. (See also: What is Work, Energy and Power?) Electric Power is the rate at which electricity does work or provides energy. The SI unit of power is the watt, one joule per second.

Electric power is usually produced by electric generators, but can also be supplied by electric batteries. Electric power is usually sold by electric companies as the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. Electric utilities measure power using an electricity meter, which keeps a running total of the electric energy delivered to a customer.

Answer 2

Answer:

The unit of electric power is watt, and hence unit of electrical energy is watt – second since energy is the product of power and time. ... One joule means the work required to be done for transferring one-ampere current in one second from one point to another point of potential difference one volt .

1 unit = 1kW h = 3.6 x 10 power 6 J

200 units = 200 x 3.6 x 10 power 6 J

                =  720000000 or 7200  x 10 power 5 J

 

                   Hope it is helpful to u !!