represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery
Answer:

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

Question 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 of cells, the positive terminal (+) of one cell always be connected to negative terminal (-) of another cell.
Question 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 positive terminal (+) of one cell always be connected to the negative terminal (-) of another cell. Here the two positive terminals are connected to each other. The correct arrangement is as follows.
Question 5.
Name any two effects of electric current.
Answer:
Heating effect of current: when an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current. Which is used in many heating applications like electric heater, electric iron light bulb, etc.
Magnetic effect of current: when an electric current flows through a wire, it generates a magnetic field around it. this effect is called the magnetic effect of current. The magnetic effect of electric current has many applications like power lift, electric bell, electric fan etc.
Question 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 switched on through a wire, the wire starts behaving as a magnet. Thus, when a compass needle is – placed near the wire, it gets influenced by the magnetic effect of electric current. Hence, the compass gets deflected from its North-South position.
Question 7.
Will the compass needle show deflection when the switch in the circuit shown in Fig. 14.24 is closed?

Answer:
No, the compass needle will not show deflection even though the switch is closed, because there is no source of electric current. (Battery or cell) An electric cell or battery needs to be connected here. In the absence of an electric. current, there is no magnetic field produced by the wires, Hence there is no deflection.
Question 8.
Fill in the blanks:
The longer line in the symbol for a cell represents its positive terminal.
The combination of two or more cells is called a battery.
When the current is switched ‘on’ in a room heater, it becomes hot.
The safety device based on the heating effect of electric current is called a fuse.
Question 9.
Mark ‘T’ if the statement is true and ‘F’ if it is false:
Answer:
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
Answer:
False
(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
Answer:
True
(c) An electromagnet does not attract a piece of iron. (T/F)
Answer:
False
Answers
Answer:
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Question 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 switched on through a wire, the wire starts behaving as a magnet. Thus, when a compass needle is – placed near the wire, it gets influenced by the magnetic effect of electric current. Hence, the compass gets deflected from its North-South position.
Question 7.
Will the compass needle show deflection when the switch in the circuit shown in Fig. 14.24 is closed?

Answer:
No, the compass needle will not show deflection even though the switch is closed, because there is no source of electric current. (Battery or cell) An electric cell or battery needs to be connected here. In the absence of an electric. current, there is no magnetic field produced by the wires, Hence there is no deflection.
Question 8.
Fill in the blanks:
The longer line in the symbol for a cell represents its positive terminal.
The combination of two or more cells is called a battery.
When the current is switched ‘on’ in a room heater, it becomes hot.
The safety device based on the heating effect of electric current is called a fuse.
Question 9.
Mark ‘T’ if the statement is true and ‘F’ if it is false:
Answer:
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
Answer:
False
(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
Answer:
True
(c) An electromagnet does not attract a piece of iron. (T/F)
Answer:
False
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