Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 718 · 40 questions

Remember (Find the topic, use the idea): Find the topic: energy, safety, conductor, closed loop, switches, cells, symbols, series or parallel. Use that lesson’s idea — complete loop, all ON for series, cells add up, one path or many. For sums, write the working and check it again.

1. 1.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) False (b) True
2. 2.🔘 A bulb and a cell are joined through 2 switches on 2 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
3. 3.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
4. 4.⚡ Which tiny particles drift along a metal wire to carry the current? (a) water drops (b) dust particles (c) electrons (d) photons
5. 5.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
6. 6.💡 4 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
7. 7.🔘 What does a switch do in a circuit? (a) stores current (b) makes electricity (c) opens or closes the loop (d) changes the voltage
8. 8.✏️ In a circuit diagram, which part is drawn as a straight line? (a) switch (b) ammeter (c) LED (d) wire
9. 9.🔘 Two switches are in series. When does the bulb glow? (a) when either is ON (b) when both are OFF (c) never (d) when both are ON
10. 10.🔌 Which metal is used for most electric wires at home? (a) rubber (b) glass (c) copper (d) plastic
11. 11.True or false: a long and a short line is the symbol for a cell. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) use small battery cells (b) take cells out after use (c) stop if a part gets hot (d) use a cable with cuts
13. 13.Which of these means the circuit is open? (a) the loop is complete (b) the switch is OFF (c) all wires are joined (d) the switch is ON
14. 14.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
15. 15.⚡ A fan changes electrical energy mainly into which kind of energy? (a) light energy (b) sound energy (c) chemical energy (d) movement energy
16. 16.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
17. 17.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) so all go off together (d) each gets full voltage
18. 18.🔘 Which kind of switch flips up or down? (a) a reed switch (b) a tilt switch (c) a slide switch (d) a toggle switch
19. 19.Which of these is not safe? (a) fly kites in open fields (b) build with an adult near (c) stay away from pylons (d) touch a switch when wet
20. 20.Which of these gives us electricity? (a) a washing machine (b) a water pump (c) a television (d) a cell
21. 21.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) by Wi-Fi (d) not joined
22. 22.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
23. 23.True or false: to use mains for a project is not safe. (a) True (b) False
24. 24.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
25. 25.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) own switch for each bulb (d) bulbs share the voltage
26. 26.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a break stops every bulb (c) each gets the full volts (d) a single current path
27. 27.🔘 When a switch is ON, the circuit is … (a) cut (b) closed (c) broken (d) open
28. 28.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) an open circuit (c) a series circuit (d) a closed circuit
29. 29.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a parallel circuit (b) a safe circuit (c) an open circuit (d) a short circuit
30. 30.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) switch (b) LED (c) bulb (d) capacitor
31. 31.🔍 Which is the odd one out? (a) a water heater (b) a school bell (c) a doorbell (d) a loudspeaker
32. 32.Which drawing is the symbol for an LED? (a) a plain rectangle (b) triangle against a bar (c) a small empty box (d) triangle, bar and arrows
33. 33.🔍 Which is the odd one out? (a) an iron nail (b) a dry cork (c) aluminium foil (d) a graphite rod
34. 34.What does a reed switch do? (a) closes near a magnet (b) slides side to side (c) closes when tipped over (d) springs back when let go
35. 35.True or false: to fly a kite near wires is not safe. (a) True (b) False
36. 36.True or false: if the switch is ON, the circuit is open and no current flows. (a) True (b) False
37. 37.Which of these mainly makes movement? (a) an electric kettle (b) a loudspeaker (c) a ceiling fan (d) a school bell
38. 38.⚠️ Is it safe to take cells out after use? (a) not safe (b) safe
39. 39.⚠️ Is it safe to use small battery cells? (a) not safe (b) safe
40. 40.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)

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