Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 144 · 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.True or false: to use LED lamps saves electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
3. 3.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
5. 5.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to use old filament bulbs saves electricity. (a) False (b) True
7. 7.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.True or false: to leave the TV on standby saves electricity. (a) False (b) True
12. 12.True or false: to close the fridge quickly saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
14. 14.🧾 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?
15. 15.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
19. 19.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to leave fridge door open wastes electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
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 2 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
27. 27.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
28. 28.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
33. 33.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
34. 34.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.True or false: to leave fridge door open saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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