Electricity Basics: 33 flashcards
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1. What is an electric cell?
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A device that converts chemical energy into electrical energy.
2. What is the function of a switch in an electric circuit?
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To make or break the circuit, controlling the flow of current.
3. What is a conductor? Give an example.
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A material that allows electric current to pass through it. Example: copper.
4. What is an insulator? Give an example.
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A material that does not allow electric current to pass through it. Example: rubber.
5. What is an electric circuit?
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A closed path through which electric current flows.
6. What is the direction of conventional current in a circuit?
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From the positive terminal of the cell to the negative terminal through the external circuit.
7. What is the unit of electric current?
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Ampere (A).
8. What is the function of a bulb in a circuit?
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It converts electrical energy into light and heat.
9. What is the symbol of a cell in a circuit diagram?
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A long line and a short line (representing positive and negative terminals).
10. What is the symbol of a bulb in a circuit diagram?
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A circle with a cross inside or a circle with a filament symbol.
11. What is the symbol of a switch in a circuit diagram?
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A gap in the wire with a movable contact.
12. What is the difference between an open and a closed circuit?
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An open circuit has a break and no current flows; a closed circuit is complete and current flows.
13. What is the function of a fuse in a circuit?
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It protects the circuit from excessive current by melting and breaking the circuit.
14. What is the function of a battery?
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It provides a continuous supply of electrical energy by converting chemical energy into electrical energy.
15. What is the function of a resistor in a circuit?
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It limits or controls the amount of current flowing in a circuit.
16. What is the function of a voltmeter?
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It measures the potential difference (voltage) across two points in a circuit.
17. What is the function of an ammeter?
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It measures the current flowing through a circuit.
18. What is the function of a diode?
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It allows current to flow in one direction only.
19. What are the main parts of a torchlight?
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A lamp, a switch, and two or more cells.
20. Why does the torch lamp glow only when the switch is in the 'on' position?
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Because the switch completes the circuit, allowing electricity to flow from the cells to the lamp.
21. What is a battery?
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A battery is formed by joining two or more cells.
22. How are cells connected to form a battery?
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The negative terminal of one cell is connected to the positive terminal of the next cell.
23. Which terminal of a cell has a flat metal cap?
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The positive (+) terminal.
24. What is the other terminal of a cell called?
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The negative (-) terminal.
25. What safety precaution should you take when experimenting with electricity?
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Never use power supply from homes or schools; use only batteries or cells.
26. Name three devices that use cells or batteries.
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Torchlights, wall clocks, radios, remotes (any three).
27. What happens to the circuit when the switch is in the 'off' position?
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The circuit is broken, so electricity does not flow and the lamp does not glow.
28. Is a single cell considered a battery?
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No, a battery requires two or more cells connected together.
29. What is the function of the switch in a torchlight?
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It controls the flow of electricity by completing or breaking the circuit.
30. What is the positive terminal of a cell?
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The terminal with a flat metal cap.
31. What is the negative terminal of a cell?
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The terminal without the flat metal cap.
32. Why is it dangerous to experiment with mains power?
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Because electricity can be dangerous and cause harm.
33. What is the purpose of the cells in a torchlight?
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They provide the electrical energy needed to light the lamp.
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