Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 937 · 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 is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
2. 2.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
5. 5.True or false: to use old filament bulbs saves electricity. (a) True (b) False
6. 6.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
7. 7.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
9. 9.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
12. 12.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.True or false: to use daylight to read wastes electricity. (a) True (b) False
15. 15.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
17. 17.True or false: to leave fridge door open wastes electricity. (a) True (b) False
18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
20. 20.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
22. 22.🧾 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?
23. 23.True or false: to leave the TV on standby saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
28. 28.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
31. 31.🧾 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?
32. 32.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 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?
34. 34.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
35. 35.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
36. 36.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps

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