Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 972 · 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.🧾 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?
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to use LED lamps wastes electricity. (a) True (b) False
8. 8.True or false: to leave fridge door open saves electricity. (a) False (b) True
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to leave the TV on standby saves electricity. (a) True (b) False
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
19. 19.True or false: to unplug idle chargers saves electricity. (a) False (b) True
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
21. 21.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
30. 30.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
32. 32.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.True or false: to leave fridge door open wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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