Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 624 · 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.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
2. 2.Which of these is an insulator? (a) a safety pin (b) a ceramic cup (c) a steel spoon (d) a graphite rod
3. 3.⚡ What does a room heater mainly change electricity into? (a) movement (b) heat (c) light (d) sound
4. 4.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
5. 5.🔘 A bulb and a cell are joined through 3 switches on 3 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?
6. 6.⚠️ Is it safe to touch a switch when wet? (a) not safe (b) safe
7. 7.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a glass marble. Does the bulb glow? (a) Yes (b) No
8. 8.💡 4 identical bulbs are joined in series with a 4 V battery (ideal wires). How many volts does each bulb get? =
9. 9.🔋 What should you do with used-up cells? (a) cut them open (b) throw them in a fire (c) bury them in soil (d) give them for recycling
10. 10.Which of these gives us electricity? (a) a mobile phone (b) a power station (c) an air conditioner (d) a water pump
11. 11.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is OFF, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
12. 12.🔍 Which is the odd one out? (a) use mains for a project (b) open a phone charger (c) build with an adult near (d) fly a kite near wires
13. 13.🔋 4 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
14. 14.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they keep glowing (d) they explode
15. 15.Which of these is a conductor? (a) a glass marble (b) a plastic ruler (c) a woollen thread (d) a steel spoon
16. 16.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
17. 17.True or false: a steel coin is a conductor. (a) True (b) False
18. 18.True or false: an electric toy car mainly gives out heat. (a) False (b) True
19. 19.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a paper strip across the gap. Does the bulb glow? (a) No (b) Yes
20. 20.🔍 Which is the odd one out? (a) build with an adult near (b) take cells out after use (c) climb an electric pole (d) dry your hands first
21. 21.Which of these is an insulator? (a) a steel coin (b) a metal paper clip (c) a copper wire (d) a dry cork
22. 22.Which of these is a conductor? (a) a glass marble (b) a copper wire (c) a rubber eraser (d) a plastic ruler
23. 23.🔘 Which kind of switch closes near a magnet? (a) a reed switch (b) a push button (c) a slide switch (d) a toggle switch
24. 24.💡 3 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
25. 25.⚡ Which tiny particles drift along a metal wire to carry the current? (a) dust particles (b) water drops (c) photons (d) electrons
26. 26.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when both are OFF (c) never (d) when either is ON
27. 27.What does a slide switch do? (a) closes near a magnet (b) springs back when let go (c) slides side to side (d) closes when tipped over
28. 28.⚠️ Is it safe to take cells out after use? (a) not safe (b) safe
29. 29.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
30. 30.🔌 Is a brass key a conductor or an insulator? (a) an insulator (b) a conductor
31. 31.Which of these is true of a parallel circuit? (a) a single current path (b) own switch for each bulb (c) bulbs share the voltage (d) one bulb out, all go out
32. 32.💡 In a series circuit, how many paths does the current have? (a) none (b) one (c) one for each bulb (d) two
33. 33.🔋 Does a solar panel give electricity or use electricity? (a) gives electricity (b) uses electricity
34. 34.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
35. 35.🔦 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
36. 36.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) symbols are heavier (c) to make it colourful (d) to hide the circuit
37. 37.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) only one (c) none (d) both of them
38. 38.Which of these uses electricity? (a) a cell (b) a power station (c) an air conditioner (d) a bicycle dynamo
39. 39.Which of these uses electricity? (a) a battery (b) a power station (c) a television (d) a wind turbine
40. 40.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a parallel circuit (b) an open circuit (c) a safe circuit (d) a short circuit

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