Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 968 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
7. 7.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
8. 8.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
19. 19.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
21. 21.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
22. 22.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
23. 23.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) run fans in empty rooms
26. 26.True or false: to use old filament bulbs saves electricity. (a) False (b) True
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
34. 34.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs

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