Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 616 · 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) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
5. 5.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
8. 8.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
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 9 hours. How many watt-hours (Wh) are saved?
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
13. 13.🧾 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?
14. 14.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
18. 18.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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?
26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
29. 29.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 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?
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) switch off empty rooms
33. 33.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to leave fridge door open wastes electricity. (a) True (b) False
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
36. 36.True or false: to use old filament bulbs saves electricity. (a) False (b) True
37. 37.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
38. 38.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
40. 40.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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