Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 873 · 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) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
8. 8.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to use daylight to read wastes electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
13. 13.True or false: to leave fridge door open saves electricity. (a) False (b) True
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
16. 16.🧾 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
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
19. 19.True or false: to leave fridge door open wastes electricity. (a) True (b) False
20. 20.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
21. 21.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) unplug idle chargers
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
24. 24.True or false: to unplug idle chargers saves electricity. (a) True (b) False
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.True or false: to leave the TV on standby saves electricity. (a) False (b) True
29. 29.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use old filament bulbs saves electricity. (a) False (b) True
32. 32.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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