Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 176 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
8. 8.🧾 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?
9. 9.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
13. 13.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
15. 15.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
16. 16.🧾 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?
17. 17.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
25. 25.True or false: to use LED lamps wastes electricity. (a) False (b) True
26. 26.🧾 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?
27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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