Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 933 · 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 is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
3. 3.True or false: to use LED lamps saves electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
33. 33.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
34. 34.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
36. 36.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
38. 38.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms

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