Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 669 · 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.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) unplug idle chargers
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
6. 6.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
9. 9.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 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?
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
13. 13.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to use old filament bulbs saves electricity. (a) False (b) True
16. 16.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
17. 17.True or false: to close the fridge quickly saves electricity. (a) False (b) True
18. 18.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
21. 21.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.True or false: to use daylight to read wastes electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
30. 30.True or false: to leave fridge door open wastes electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.True or false: to unplug idle chargers saves electricity. (a) False (b) True
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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