Question

An electric kettle is rated as $25kW,250V$. Find the cost of running the kettle for two hours at 60 paisa per unit.

Answer 1

Step 1: Given data

Supplied voltage is, $V=250volt.$

The power of the kettle is, $P=25watt.$

Step 2: Power

Power is the amount of energy consumed by a circuit in a unit time.

Power is defined by the form, $P=\frac{E}{t}$, where, E is the total electric energy and t is the time of current flow.

Step 3: Calculation of current unit

As we know, power, $P=\frac{E}{t}$

So, total units consumed,

$$\begin{gathered} E=P\times t=25\times 2=50 \\ orE=50units. \end{gathered}$$

Now coast of $50units$ for two hours is, =

$50\times 60=3000paisa$

Therefore, the cost of running the kettle for two hours is 30 rupees.