Question

Find the expenditure at a rate of Rs \[3.5\] per unit for using \[40\] watt bulb for \[6\] hours daily for \[1\] month?

Answer 1

Hint: Unit of electricity for domestic use is Kilowatt-hour. The average household electricity consumption per year in the United States is \[10,766{\text{ }}kWh\] . The household electricity consumption in India is estimated to be \[206.7{\text{ }}KWH\] per capita as per capita. Refrigerators consume a third of all domestic appliances.

Formula used:
To calculate the total unit of watts per day
Watts \[x\] hours
To find total usage multiply days
Days \[x\] units

Complete step by step answer:
Given: Rate = Rs.\[3.5\] per unit
Power =\[40\] watt
Time =\[6\] hours
Days = $1$ month
Multiply power with time to get a unit of watts per day.
$\Rightarrow 40watts \times 6hours = 240watts $
To get value in kilowatts divide the value with $1000$
$ \Rightarrow \;40watts \times 6hours = 0.24kilowatts$
To find total usage, multiply days with unit value.
$\Rightarrow 30days \times 0.24units = 7.2units$ total usage
The average cost of a unit in India is about Rs.\[3.5\]
$\Rightarrow 7.2 \times Rs.3.5 = Rs.25.2$

Note: The amount of energy transferred per unit of time is known as power. The SI unit of power is the watt. Energy and power are closely related.
Formula for power \[P = \dfrac{W}{T}\]
\[P\] is power,
\[W\] is work done
\[T\] IS time taken
Electricity is associated with constant or moving electric charges. "Electricity" often means "electrical energy". An example of electricity is lightning and energy used to force the light bulb. Types of sources used to generate electricity are fossil fuels, renewable energy, mainly hydroelectric.
Michael Faraday is called the father of electricity. Different types of electricity are static electricity, current electricity, Hydroelectricity, solar electricity.