Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 973 · 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 5 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
3. 3.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
12. 12.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
13. 13.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
25. 25.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
29. 29.True or false: to switch off empty rooms saves electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to use daylight to read saves electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
35. 35.True or false: to leave the TV on standby saves electricity. (a) True (b) False
36. 36.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
39. 39.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

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