Electricity is an important form of energy, and it has an important place in modern society. It is a convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on. When an electric current is passed through a high resistance wire is becoming very hot due to heat produced by electric current. This is called a heating effect of electric current. The electric laundry iron, electric toaster electric oven and electric heater are some familiar devices based on heating effect. The electric heating is also used to produce light, as in an electric bulb.

What is the heating effect to electric current? 

Electricity is an important form of energy, and it has an important place in modern society. It is a convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on. When an electric current is passed through a high resistance wire is becoming very hot due to heat produced by electric current. This is called a heating effect of electric current. The electric laundry iron, electric toaster electric oven and electric heater are some familiar devices based on heating effect. The electric heating is also used to produce light, as in an electric bulb.

As a student what initiative would you take in the common concern of 'Save electric energy'. 

Ramesh and Suresh are neighbours and study in the same class $\mathrm{X}$. Ramesh decorated his home on Diwali with many electric bulbs but Suresh failed to do so. Ramesh told him that if we want to connect many electric bulbs for decorating our home, then we should connect them in a series circuit. It is because, in series circuits, the current is smaller and constant throughout the electric circuit also in a series circuit, all the bulbs can be turned on or turned off with just one switch. Ramesh helped Suresh for decorating. Thus, Suresh learned the connection and became very happy on seeing the decoration of his home.

Give two advantages of a series circuit in connecting the electric bulbs for decoration.  

The current $\left(\mathrm{mA}\right)$ flowing through a resistor connected in an electrical circuit and the potential $\left(\mathrm{volt}\right)$ difference developed across its ends are shown in the given diagrams: Determine the value of resistance of the resistor in ohm.

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series?

If the reading of voltmeter and ammeter are $1.0 \mathrm{volt}$ and $0.5 \mathrm{A}$, then what will be the value of resistance of the resistor?