Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 891 · 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 wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
4. 4.🧾 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?
5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
8. 8.🧾 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?
9. 9.True or false: to leave the TV on standby saves electricity. (a) True (b) False
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
20. 20.🧾 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?
21. 21.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
25. 25.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
30. 30.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
33. 33.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
34. 34.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
38. 38.True or false: to use old filament bulbs saves electricity. (a) True (b) False
39. 39.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 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?

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