Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 647 · 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 saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.🧾 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?
7. 7.True or false: to use old filament bulbs saves electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
10. 10.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
13. 13.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
19. 19.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
24. 24.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
26. 26.True or false: to use LED lamps wastes electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. 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 8 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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