Question

An electric meter reads $8950\,KWh$ at the end of the month, while at the beginning of the month the reading was $8833\,KWh$. How many units of electricity are consumed? If one unit costs $Rs\,4.30$, find the cost of the electricity energy consumed.

Answer 1

Hint:Here first we have to take the initial and final meter reading and then find the energy consumed during the month. Then we can find the cost of the electricity energy consumed by multiplying the total energy consumed during the month with the rate of one unit.

Complete step by step answer:
Final reading of the meter$ = 8950\,KWh$.
Initial reading of the meter$ = 8833\,KWh$.
Therefore, energy consumed during the month$ = 8950 - 8833 = 117\,KWh$.
Rate of one unit $ = Rs.\,4.30$
Therefore, cost of $117$ units is,
$
Cost = Rs.4.30 \times 117 \\
\therefore Cost = Rs.\,503.10 \\ $
Thus, the cost of the electricity energy consumed is $Rs.503.10$.

Additional information:
In our everyday lives, the heating effect of electric current is commonly used. As alternatives to the traditional cooking and washing techniques, the electric hammer, kettle, toaster, heater, etc. are used. The same is used in electric lamps, which are traditional light equivalents. Over the years, these machines have revolutionised the world. We will address the idea of the heating effect of electric current and its applications in this section.

When an electric current flows through a conductor, due to the hindrance provided by the conductor to the flowing current, it produces heat. The work performed to overcome the impediment to the current induces heat in the conductor.

The explanation behind the electric current heating effect is that as the current travels through a conductor, the electrons have to meet the conductor's resistance, which results in energy loss, and this energy loss is converted into heat energy.

Note:$1$ unit Electricity is the quantity of electrical energy absorbed in $1$ hour by a load of $1\,kW$ rated capacity. It is literally Joule's electrical energy consumption measurement unit. $1\,KWh$ (kilowatt hour) and $1$ Unit are similar, respectively.