Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 953 · 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: “a single current path” is true of a series circuit. (a) True (b) False
2. 2.🔗 Series or parallel circuit: “own switch for each bulb”? (a) parallel (b) series
3. 3.🔘 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?
4. 4.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
5. 5.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is OFF, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
6. 6.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) only when both are ON (c) when either is ON (d) never
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.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
9. 9.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
10. 10.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
11. 11.True or false: a push button stays where you flip it. (a) False (b) True
12. 12.💡 6 identical bulbs are in parallel and each one takes 0.5 A. What total current (in amperes) comes from the battery? =
13. 13.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) light energy (d) sound energy
14. 14.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in parallel (c) by Wi-Fi (d) in series
15. 15.💡 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
16. 16.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a plug top (b) a fuse or MCB (c) a long wire (d) a bulb
17. 17.True or false: “own switch for each bulb” is true of a parallel circuit. (a) True (b) False
18. 18.🔋 6 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
19. 19.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
20. 20.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) electric current (c) sound (d) friction
21. 21.Which of these is an insulator? (a) a cotton thread (b) a safety pin (c) a steel coin (d) a graphite rod
22. 22.🔦 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 copper wire. Does the bulb glow? (a) No (b) Yes
23. 23.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
24. 24.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
25. 25.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
26. 26.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) closed (d) open
27. 27.⚡ What does a water heater mainly change electricity into? (a) heat (b) movement (c) sound (d) light
28. 28.Which of these is safe? (a) fly kites in open fields (b) poke things in a socket (c) climb an electric pole (d) use a cable with cuts
29. 29.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) No (b) Yes
30. 30.🔍 Which is the odd one out? (a) a night lamp (b) a toaster (c) a traffic signal (d) a street light
31. 31.🔍 Which is the odd one out? (a) a glass marble (b) a copper wire (c) an iron nail (d) a brass key
32. 32.🔘 A bulb and a cell are joined through 4 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
33. 33.💡 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. Does bulb 1 glow? (a) No (b) Yes
34. 34.🔋 2 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
35. 35.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a cotton thread across the gap. Does the bulb glow? (a) Yes (b) No
36. 36.True or false: to build with an adult near is not safe. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) touch a fallen wire (b) fly kites in open fields (c) take cells out after use (d) keep drinks far away
38. 38.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
39. 39.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the longer line (c) the shorter line (d) neither line
40. 40.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe

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