Answer to Question #189372 in Mechanics | Relativity for Chris Domingo

Question

Here is an extract from our electricity bill. The coloured text has been added to highlight the rate, with the 'rate' being the price per kW.hr:

Over the 92 days of this bill, what is the average rate at which the company supplied energy to this household? P =

P= _____  Watts 

. (Take the 92 days as 2 significant figures: the electricity meter is read by an employee whose time of reading could be at any time during the day.)

Also, don't give an answer, but think about how many 'labourers' (using the example in the lesson) we would need to employ to provide energy at this average rate.

Answer 1

Given extract in question:

for the above question, we consider only electricity we buy from the company.

here time span= 92 days (not considering time of reading taken)

total energy used=294.3 kWh

the energy supplied per day,

${294.3 \over92}=3.19891$ kWh =3198.91 Wh

and energy supplied per hour is,

${3198.91 \over24 }=133.287$ W

therefore the average rate of power (energy) supplied by the company is:

$\boxed {P= 133.287 W}$ ........

$\bigstar$ answer is

P= 133.287 Watts

money to be paid for this average power will be :

${24.9000c \over1000} \times133.287=3.31885 c$