NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

 

NCERT solutions for class 7 science chapter 14 Electric Current and Its Effects: If you are a class 7 student who is following NCERT book, then a tool like solutions of NCERT for class 7 science chapter 14 electric current and its effects is helpful in the preparation of the chapter. Electric current and effect deal with the concepts of representation of electrical components such as bulb, switch, battery etc using symbols, the heating effect and magnetic of current and also electromagnet and its applications. The CBSE NCERT solutions for class 7 science chapter 14 electric current and its effects help students to be familiar with the concepts studied in the chapter. Solutions of NCERT for class 7 science chapter 14 electric current and its effects will give you answers to all the thirteen questions which are mentioned in exercise. The solutions of NCERT is an important tool for a student who is following the NCERT syllabus.

NCERT solutions for class 7 science chapter 14 electric current and its effects exercise:

1. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery

Answer:

Symbols for various components of electrical circuits are-

Electric Components Symbols
Connecting Wires

Switch OFF position

Bulb

Cell

Switch ON position

Battery

2. Draw the circuit diagram to represent the circuit shown in Fig.14.21.

Answer:

In the above figure, one end of the cell is connected to bulb and the other is connected to switch. The switch is in OFF position. One end of the bulb is connected to switch and the other is with the cell.
The circuit diagram of the above-given figure is-

3. Fig.14.22 shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

Answer:

To make a battery from the four cell we need to connect the one positive end of a cell to the negative end of the other cell. In this way, we can form a four-cell battery.

4. The bulb in the circuit shown in Fig.14.23 does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Answer:

The problem in the above circuit diagram is that cells are not connected properly, both the positive terminal of a cell is connected. To glow bulb, the positive end of the cell must be connected with the negative end of the other cell. As shown in the figure:-

5. Name any two effects of electric current.

Answer:

The two effects of electric current are-
(i) Heating effect- When current is passing through the wires, the wires become hot and produces heat.

(ii) Magnetic Effect- When current is passing through the wires, it behaves like a magnet.

6. When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Answer:

When the current is passing through the wires, it behaves like a magnet and rises to a magnetic field around it which exerts a magnetic force on the compass needle and reflects it from North-South position.