Educational worksheet on electricity and circuits for students, featuring questions about sources of electricity, circuit components, and troubleshooting a non-functioning bulb.
Worksheet titled "Electricity and Circuits" with multiple-choice questions, a diagram to complete, and word answers for electricity concepts.
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Show Answer Key & Explanations
Step-by-step solution for: Electricity Grades 4-6 | A Example | efarmers.ng
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Show Answer Key & Explanations
Step-by-step solution for: Electricity Grades 4-6 | A Example | efarmers.ng
Let's go through each question in the worksheet "Electricity and Circuits" step by step and solve them with explanations.
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#### A. Which of the following is the source of electricity in a mobile phone?
- a. Solar cell
- b. Charger
- c. Primary cell
- d. Secondary cell
✔ Correct answer: d. Secondary cell
🔹 Explanation:
A mobile phone uses a rechargeable battery, which is a secondary cell. Secondary cells can be recharged multiple times (unlike primary cells, which are disposable). The charger supplies electricity to recharge the battery, but the actual source of electricity during use is the battery (secondary cell).
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#### B. Which device is used to make or break a circuit?
- a. Closed circuit
- b. Insulator
- c. Switch
- d. Open circuit
✔ Correct answer: c. Switch
🔹 Explanation:
A switch is a device that controls the flow of electricity by either completing (closing) or breaking (opening) the circuit. A closed circuit allows current to flow; an open circuit stops it. So, the switch is the component that does this action.
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#### C. LED Stands for.
- a. Light Emulation diode
- b. Light Emitting diode
- c. Load Emitting disc
- d. Load Emulation digital
✔ Correct answer: b. Light Emitting diode
🔹 Explanation:
LED stands for Light Emitting Diode — a semiconductor device that emits light when electric current passes through it. It’s commonly used in displays, indicators, and lighting.
---
> *(Note: Since we can't see the image, I’ll describe how to complete it based on typical diagrams.)*
Usually, such a diagram shows:
- A battery (with + and – terminals)
- A bulb
- Wires
- Possibly a switch
To make the bulb glow, you need a complete circuit.
✔ How to complete the diagram:
- Connect one wire from the positive terminal (+) of the battery to one terminal of the bulb.
- Connect another wire from the other terminal of the bulb to the negative terminal (–) of the battery.
- If there's a switch, include it in the circuit so it can control the flow.
📌 Key idea: The circuit must be closed (no gaps), and all components must be connected in a loop.
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#### a. Device that converts chemical energy to electricity.
✔ Answer: Cell (or Battery)
🔹 *Explanation:* A cell (like a battery) converts stored chemical energy into electrical energy through chemical reactions.
#### b. A material that does not allow electric current to pass through it.
✔ Answer: Insulator
🔹 *Explanation:* An insulator resists the flow of electric current (e.g., rubber, plastic).
#### c. A cell that cannot be recharged.
✔ Answer: Primary cell
🔹 *Explanation:* Primary cells (like alkaline batteries) are single-use and cannot be recharged. Once drained, they are discarded.
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#### a. List three possible reasons why the bulb does not glow.
✔ Possible reasons:
1. Dead batteries – The cells may be drained and unable to supply power.
2. Broken filament in the bulb – The thin wire inside the bulb might have burned out.
3. Loose connection or faulty switch – Poor contact between wires, battery, or switch prevents current flow.
Other possibilities:
- Corroded battery contacts
- Broken wire inside the torch
- Bulb not properly screwed in
---
#### 1. Multiple Choice
- A: d. Secondary cell
- B: c. Switch
- C: b. Light Emitting diode
#### 2. Diagram Completion
- Draw wires connecting the + terminal of the battery → bulb → – terminal of the battery, forming a complete loop.
#### 3. One-word answers
- a. Cell
- b. Insulator
- c. Primary cell
#### 4. Detective Challenge
- a. Possible reasons:
1. Dead batteries
2. Burnt-out bulb filament
3. Loose or broken connection
---
Let me know if you'd like a visual sketch description or help with drawing the completed circuit!
---
1. Choose the correct answer.
#### A. Which of the following is the source of electricity in a mobile phone?
- a. Solar cell
- b. Charger
- c. Primary cell
- d. Secondary cell
✔ Correct answer: d. Secondary cell
🔹 Explanation:
A mobile phone uses a rechargeable battery, which is a secondary cell. Secondary cells can be recharged multiple times (unlike primary cells, which are disposable). The charger supplies electricity to recharge the battery, but the actual source of electricity during use is the battery (secondary cell).
---
#### B. Which device is used to make or break a circuit?
- a. Closed circuit
- b. Insulator
- c. Switch
- d. Open circuit
✔ Correct answer: c. Switch
🔹 Explanation:
A switch is a device that controls the flow of electricity by either completing (closing) or breaking (opening) the circuit. A closed circuit allows current to flow; an open circuit stops it. So, the switch is the component that does this action.
---
#### C. LED Stands for.
- a. Light Emulation diode
- b. Light Emitting diode
- c. Load Emitting disc
- d. Load Emulation digital
✔ Correct answer: b. Light Emitting diode
🔹 Explanation:
LED stands for Light Emitting Diode — a semiconductor device that emits light when electric current passes through it. It’s commonly used in displays, indicators, and lighting.
---
2. Complete the diagram so that bulb can start to glow.
> *(Note: Since we can't see the image, I’ll describe how to complete it based on typical diagrams.)*
Usually, such a diagram shows:
- A battery (with + and – terminals)
- A bulb
- Wires
- Possibly a switch
To make the bulb glow, you need a complete circuit.
✔ How to complete the diagram:
- Connect one wire from the positive terminal (+) of the battery to one terminal of the bulb.
- Connect another wire from the other terminal of the bulb to the negative terminal (–) of the battery.
- If there's a switch, include it in the circuit so it can control the flow.
📌 Key idea: The circuit must be closed (no gaps), and all components must be connected in a loop.
---
3. Give one word answer for the following questions.
#### a. Device that converts chemical energy to electricity.
✔ Answer: Cell (or Battery)
🔹 *Explanation:* A cell (like a battery) converts stored chemical energy into electrical energy through chemical reactions.
#### b. A material that does not allow electric current to pass through it.
✔ Answer: Insulator
🔹 *Explanation:* An insulator resists the flow of electric current (e.g., rubber, plastic).
#### c. A cell that cannot be recharged.
✔ Answer: Primary cell
🔹 *Explanation:* Primary cells (like alkaline batteries) are single-use and cannot be recharged. Once drained, they are discarded.
---
4. You switch on an electric torch, but the bulb does not glow. Become a detective and solve the mystery.
#### a. List three possible reasons why the bulb does not glow.
✔ Possible reasons:
1. Dead batteries – The cells may be drained and unable to supply power.
2. Broken filament in the bulb – The thin wire inside the bulb might have burned out.
3. Loose connection or faulty switch – Poor contact between wires, battery, or switch prevents current flow.
Other possibilities:
- Corroded battery contacts
- Broken wire inside the torch
- Bulb not properly screwed in
---
✔ Final Answers Summary:
#### 1. Multiple Choice
- A: d. Secondary cell
- B: c. Switch
- C: b. Light Emitting diode
#### 2. Diagram Completion
- Draw wires connecting the + terminal of the battery → bulb → – terminal of the battery, forming a complete loop.
#### 3. One-word answers
- a. Cell
- b. Insulator
- c. Primary cell
#### 4. Detective Challenge
- a. Possible reasons:
1. Dead batteries
2. Burnt-out bulb filament
3. Loose or broken connection
---
Let me know if you'd like a visual sketch description or help with drawing the completed circuit!
Parent Tip: Review the logic above to help your child master the concept of 4th grade electricity worksheet.
