Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 221 · 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.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
3. 3.True or false: to touch a fallen wire is safe. (a) True (b) False
4. 4.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
5. 5.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) all wires are joined (d) a cell is taken out
6. 6.What does a reed switch do? (a) stays where you flip it (b) closes when tipped over (c) closes near a magnet (d) springs back when let go
7. 7.True or false: aluminium foil is a conductor. (a) True (b) False
8. 8.Which of these gives us electricity? (a) a television (b) a washing machine (c) a computer (d) a solar panel
9. 9.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 2 and 3 are taken out of their holders. How many bulbs glow?
10. 10.🔍 Which is the odd one out? (a) touch a fallen wire (b) use a cable with cuts (c) use mains for a project (d) build with an adult near
11. 11.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
12. 12.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a slide switch (c) a push button (d) a toggle switch
13. 13.Which of these is an insulator? (a) a copper wire (b) a steel coin (c) a brass key (d) a cotton thread
14. 14.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) cell (b) bulb (c) wire (d) ammeter
15. 15.🔌 Which metal is used for most electric wires at home? (a) glass (b) plastic (c) rubber (d) copper
16. 16.What does a tilt switch do? (a) springs back when let go (b) closes near a magnet (c) flips up or down (d) closes when tipped over
17. 17.🔋 How many volts does one ordinary torch cell give? (a) 0.5 V (b) 15 V (c) 1.5 V (d) 230 V
18. 18.Which of these is safe? (a) fly a kite near wires (b) poke things in a socket (c) use mains for a project (d) use small battery cells
19. 19.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
20. 20.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) False (b) True
21. 21.🔋 4 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
22. 22.True or false: to use a cable with cuts is safe. (a) True (b) False
23. 23.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the shorter line (c) the longer line (d) neither line
24. 24.True or false: to stay away from pylons is safe. (a) True (b) False
25. 25.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
26. 26.🔘 A bulb and a cell are joined through 6 switches on 6 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?
27. 27.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) switch (b) junction (c) capacitor (d) battery
28. 28.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
29. 29.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
30. 30.⚡ What does an LED lamp mainly change electricity into? (a) movement (b) heat (c) light (d) sound
31. 31.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a wooden stick across the gap. Does the bulb glow? (a) Yes (b) No
32. 32.Which of these is true of a series circuit? (a) bulbs share the voltage (b) one out, the rest glow (c) many paths for current (d) own switch for each bulb
33. 33.🔋 2 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
34. 34.⚠️ Is it safe to take cells out after use? (a) not safe (b) safe
35. 35.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) motor (b) battery (c) bulb (d) wire
36. 36.True or false: to keep drinks far away is not safe. (a) False (b) True
37. 37.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
38. 38.True or false: a circle with a cross is the symbol for a voltmeter. (a) False (b) True
39. 39.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) both of them (c) none (d) only one
40. 40.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)

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