Archana Shukla Solutions for Chapter: Electric Current and its Effects, Exercise 6: EVALUATE

Draw a well-labelled diagram of a closed electric circuit.

How does an electric current flow in a closed circuit? Explain.

An electric oven of $3 \mathrm{kW}$ is connected to the mains of $220 \mathrm{V}$. Calculate:

The amount of energy consumed if the oven is switched on for an hour.

An electric oven of $3 \mathrm{kW}$ is connected to the mains of $220 \mathrm{V}$. Calculate:

The cost of electrical energy consumed if the cost per unit is $\mathrm{Rs}. 6.50$ and if the oven is switched on for an hour.

How much energy is used for boiling water in a $2 \mathrm{kW}$ kettle for $10 \mathrm{minutes}$? Calculate it in watt-hour.

A mobile phone is one of the many electrical appliances, which makes use of both the chemical and magnetic effects of an electric current. Can you describe how the mobile phone makes use of these effects?

In many electrical appliances such as an electric oven, iron, and kettle, an automatic switch is used. The switch automatically switches off when the task is over. How does the automatic switch of these appliances reduce electrical energy wastage?    

When four identical electric bulbs are connected as shown in figure A, they glow with normal brightness. Which of the following statements is correct when these bulbs are connected as shown in figure B?