Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 729 · 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.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
2. 2.⚠️ Is it safe to poke things in a socket? (a) not safe (b) safe
3. 3.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) it is just untidy (c) water carries current (d) it spoils the paint
4. 4.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a safe circuit (b) a short circuit (c) an open circuit (d) a parallel circuit
5. 5.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) many paths for current (c) a break stops every bulb (d) a single current path
6. 6.True or false: a circle with a cross is the symbol for a motor. (a) False (b) True
7. 7.💡 2 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 1 and 2 are taken out of their holders. How many bulbs glow?
8. 8.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
9. 9.🔍 Which is the odd one out? (a) stop if a part gets hot (b) fly a kite near wires (c) throw cells in a fire (d) touch a switch when wet
10. 10.Which of these mainly makes movement? (a) a ceiling fan (b) a buzzer (c) a siren (d) a water heater
11. 11.Which of these uses electricity? (a) a generator (b) a bicycle dynamo (c) a solar panel (d) a television
12. 12.⚡ What does a torch mainly change electricity into? (a) light (b) movement (c) heat (d) sound
13. 13.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to make it colourful (d) to hide the circuit
14. 14.🔋 Identical cells side by side (in parallel) give … (a) double the voltage (b) half the voltage (c) the same voltage (d) no voltage
15. 15.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) junction (b) resistor (c) switch (d) battery
16. 16.Which of these mainly gives out heat? (a) an LED lamp (b) a toaster (c) a loudspeaker (d) a traffic signal
17. 17.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
18. 18.⚡ What does a siren mainly change electricity into? (a) sound (b) movement (c) heat (d) light
19. 19.🔋 5 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
20. 20.🔘 What does a switch do in a circuit? (a) makes electricity (b) changes the voltage (c) opens or closes the loop (d) stores current
21. 21.True or false: a brass key is a conductor. (a) False (b) True
22. 22.⚠️ Which power source should children use for electronics projects? (a) a mains extension board (b) an inverter socket (c) a wall socket (d) a small battery pack
23. 23.Which of these is true of a series circuit? (a) a break stops every bulb (b) many paths for current (c) each gets the full volts (d) own switch for each bulb
24. 24.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) capacitor (b) bulb (c) battery (d) LED
25. 25.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) light energy (d) sound energy
26. 26.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
27. 27.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
28. 28.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
29. 29.True or false: a circle with A inside is the symbol for a motor. (a) True (b) False
30. 30.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they get dimmer (c) they all go out (d) they explode
31. 31.True or false: a rubber eraser is an insulator. (a) False (b) True
32. 32.🔘 A bulb and a cell are joined through 4 switches on 4 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?
33. 33.True or false: a small empty box is the symbol for a capacitor. (a) True (b) False
34. 34.✏️ In a circuit diagram, wires are usually drawn as … (a) straight lines (b) little stars (c) dotted circles (d) wavy lines
35. 35.What does a reed switch do? (a) works only while pressed (b) flips up or down (c) stays where you flip it (d) closes near a magnet
36. 36.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
37. 37.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) resistor (b) motor (c) switch (d) cell
38. 38.Which of these is true of a series circuit? (a) one out, the rest glow (b) own switch for each bulb (c) used in house wiring (d) a single current path
39. 39.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
40. 40.⚠️ Is it safe to touch a fallen wire? (a) not safe (b) safe

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