Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 617 · 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.🧾 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?
2. 2.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
3. 3.True or false: to use LED lamps wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
5. 5.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
8. 8.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
10. 10.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
14. 14.True or false: to close the fridge quickly saves electricity. (a) False (b) True
15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
16. 16.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
19. 19.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
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 2 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
23. 23.True or false: to use daylight to read saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
25. 25.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 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?
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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