Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 887 · 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 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
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 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
12. 12.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
13. 13.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
19. 19.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🧾 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?
21. 21.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 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?
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
24. 24.True or false: to switch off empty rooms saves electricity. (a) True (b) False
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to leave the TV on standby saves electricity. (a) True (b) False
33. 33.🧾 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?
34. 34.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
35. 35.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
40. 40.🧾 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?

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