1. Sketch the symbols for the following electrical circuit parts in your notebook: connecting wires, switch in the "OFF" position, bulb, cell, switch in the "ON" position, battery.
1. Sketch the symbols for the following electrical circuit parts in your notebook: connecting wires, switch in the "OFF" position, bulb, cell, switch in the "ON" position, battery.
Explanation:
2. Draw the circuit diagram to represent the circuit shown in Fig.14.21
2. Draw the circuit diagram to represent the circuit shown in Fig.14.21
Explanation:
3. Four cells are mounted on a board in Fig. 14.22. Draw lines to show how you will attach wires to their terminals to create a four-cell battery.
3. Four cells are mounted on a board in Fig. 14.22. Draw lines to show how you will attach wires to their terminals to create a four-cell battery.
Explanation:
4. The circuit in Fig. 14.23 does not have a glowing bulb. Can you pinpoint the issue? To get the bulb to glow, perform the circuit adjustments that are required.
4. The circuit in Fig. 14.23 does not have a glowing bulb. Can you pinpoint the issue? To get the bulb to glow, perform the circuit adjustments that are required.
Explanation:
The combination of two cells on this circuit causes the problem. To make the lightbulb glow in this circuit, the positive terminal of one cell and the negative terminal of the other cell must be linked.
5. What are two electric current effects?
5. What are two electric current effects?
Explanation:
The following are the consequences of electric current:
(i) Electric current can result in illumination and heating.
(ii) An electric current can form a temporary magnet from a straight conductor.
6. A nearby compass needle is thrown off-course when the current is turned on through a wire, causing it to lose its north-south orientation. Why not?
6. A nearby compass needle is thrown off-course when the current is turned on through a wire, causing it to lose its north-south orientation. Why not?
Explanation:
Electric current acts like a magnet when it flows over a wire, deflecting the compass needle, which is also made of magnets.
7. When the circuit's switch is closed, will the compass needle deflect? according to figure 14.24.
7. When the circuit's switch is closed, will the compass needle deflect? according to figure 14.24.
Explanation:
No, there is nothing here, hence no current can pass.
8. Complete the gaps:
(a) The cell symbol's longer line denotes the cell's _______ terminal.
(b) A ________ is a grouping of two or more cells.
(c) When a room heater's current is turned "on," it .
(d) A _____ is the name of the safety device that relies on the heating action of electric current.
8. Complete the gaps:
(a) The cell symbol's longer line denotes the cell's _______ terminal.
(b) A ________ is a grouping of two or more cells.
(c) When a room heater's current is turned "on," it .
(d) A _____ is the name of the safety device that relies on the heating action of electric current.
Explanation:
(a) positive
(b) battery
(c) battery getting hot
(d) fuse
9. If a statement is true, mark "T," otherwise, mark "F":
The negative terminal of one cell is linked to the negative terminal of the other cell to create a battery with two cells (a). (T/F)
(b) The fuse wire melts and breaks when the electric current flowing through it reaches a specified threshold. (T/F)
(c) A piece of iron is not drawn to an electromagnet. (T/F)
(d) An electromagnet is a part of an electric bell. (T/F)
9. If a statement is true, mark "T," otherwise, mark "F":
The negative terminal of one cell is linked to the negative terminal of the other cell to create a battery with two cells (a). (T/F)
(b) The fuse wire melts and breaks when the electric current flowing through it reaches a specified threshold. (T/F)
(c) A piece of iron is not drawn to an electromagnet. (T/F)
(d) An electromagnet is a part of an electric bell. (T/F)
Explanation:
(a)False
(b) True
(c) True
(d) False
10. Do you believe it is possible to use an electromagnet to separate plastic bags from a rubbish pile? Explain.
10. Do you believe it is possible to use an electromagnet to separate plastic bags from a rubbish pile? Explain.
Explanation:
No, because plastic is not attracted by an electromagnet. Only magnetic materials, such as iron, are drawn to an electromagnet.
11. Your home is undergoing repairs by an electrician. He wants to use a wire to replace a fuse. Do you concur? Provide justifications for your answer?
11. Your home is undergoing repairs by an electrician. He wants to use a wire to replace a fuse. Do you concur? Provide justifications for your answer?
Explanation:
No, even when a large current passes through an electric wire, it won't melt. Hence, it won't demonstrate the harm caused by high current.
12. Using the cell holder, switch, and bulb seen in Fig. 14.4, Zubeda created an electric circuit. The lamp did not light up when she turned the switch to the "ON" position. Aid Zubeda in locating any potential circuit flaws.
12. Using the cell holder, switch, and bulb seen in Fig. 14.4, Zubeda created an electric circuit. The lamp did not light up when she turned the switch to the "ON" position. Aid Zubeda in locating any potential circuit flaws.
Explanation:
Possible causes of the bulb not glowing include:
(i) A loose connecting wire.
(ii) The cells have been utilised up.
(iii) Bulb may be fused.
(iv) Cell terminals might not be in the ideal location.
13. In the circuit depicted in Fig.
(i) If the switch is set to "OFF," do any of the bulbs glow?
(ii) When the switch is turned to the "ON" position, what sequence will the bulbs A, B, and C glow in?
13. In the circuit depicted in Fig.
(i) If the switch is set to "OFF," do any of the bulbs glow?
(ii) When the switch is turned to the "ON" position, what sequence will the bulbs A, B, and C glow in?
Explanation:
(i) No
(ii) The bulbs won't all glow at the same time.
