Electronics Worksheet: Electricity Basics Test

Electronics lesson 10: Part 1 test: electricity basics · Set 349 · 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.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) own switch for each bulb (c) a break stops every bulb (d) a single current path
2. 2.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) water carries current (c) water makes it cold (d) it spoils the paint
3. 3.💡 In a series circuit, how many paths does the current have? (a) two (b) one for each bulb (c) one (d) none
4. 4.💡 4 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
5. 5.🔍 Which is the odd one out? (a) a glass marble (b) a graphite rod (c) an iron nail (d) a steel coin
6. 6.Which of these gives us electricity? (a) a television (b) an air conditioner (c) a water pump (d) a power station
7. 7.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) No (b) Yes
8. 8.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
9. 9.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they all go out (c) they keep glowing (d) they get dimmer
10. 10.True or false: a copper wire is a conductor. (a) False (b) True
11. 11.🔁 What do we call a circuit with a break in it? (a) a closed circuit (b) a full circuit (c) a series circuit (d) an open circuit
12. 12.Which of these is safe? (a) touch a switch when wet (b) stay away from pylons (c) use mains for a project (d) throw cells in a fire
13. 13.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a plastic gap (d) a complete loop
14. 14.🔘 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?
15. 15.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) so all go off together (c) to save copper only (d) to make bulbs dim
16. 16.True or false: a siren mainly gives out heat. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) an electric iron (b) a rice cooker (c) a doorbell (d) a water heater
18. 18.✏️ Why do engineers draw circuits with symbols? (a) to hide the circuit (b) to make it colourful (c) symbols are heavier (d) quick and clear for all
19. 19.💡 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?
20. 20.🔋 Does a solar panel give electricity or use electricity? (a) gives electricity (b) uses electricity
21. 21.✏️ In a cell symbol, which line is the + terminal? (a) the longer line (b) the shorter line (c) both lines (d) neither line
22. 22.🔋 How many volts does one ordinary torch cell give? (a) 0.5 V (b) 15 V (c) 230 V (d) 1.5 V
23. 23.True or false: a circle with a cross is the symbol for a bulb. (a) False (b) True
24. 24.🔌 Most metals are good … (a) batteries (b) conductors (c) magnets only (d) insulators
25. 25.🔋 5 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
26. 26.⚡ What does a water heater mainly change electricity into? (a) movement (b) heat (c) sound (d) light
27. 27.💡 3 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
28. 28.⚡ What does a street light mainly change electricity into? (a) heat (b) movement (c) sound (d) light
29. 29.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
30. 30.⚠️ Is it safe to use small battery cells? (a) not safe (b) safe
31. 31.🔋 Does a computer give electricity or use electricity? (a) uses electricity (b) gives electricity
32. 32.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) LED (b) bulb (c) junction (d) motor
33. 33.True or false: aluminium foil is a conductor. (a) False (b) True
34. 34.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) friction (c) sound (d) electric current
35. 35.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
36. 36.💡 5 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
37. 37.Which drawing is the symbol for a resistor? (a) a circle with M inside (b) a long and a short line (c) a small empty box (d) a circle with V inside
38. 38.True or false: a wooden stick is a conductor. (a) True (b) False
39. 39.🔋 Cells joined + to − in a row (series) give … (a) no voltage (b) a smaller voltage (c) the same voltage (d) a bigger voltage
40. 40.🔋 A 3 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =

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