Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 484 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.🧾 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?
3. 3.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
4. 4.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
5. 5.True or false: to close the fridge quickly saves electricity. (a) False (b) True
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
8. 8.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
10. 10.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
18. 18.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
19. 19.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
22. 22.True or false: to use daylight to read wastes electricity. (a) True (b) False
23. 23.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
25. 25.True or false: to leave fridge door open saves electricity. (a) False (b) True
26. 26.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 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?
32. 32.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
38. 38.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 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?
40. 40.True or false: to leave fridge door open wastes electricity. (a) True (b) False

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