Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 236 · 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 of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
2. 2.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.True or false: to use LED lamps wastes electricity. (a) True (b) False
4. 4.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 9 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
14. 14.True or false: to leave fridge door open saves electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
23. 23.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
30. 30.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (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 3 hours. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.True or false: to leave fridge door open wastes electricity. (a) True (b) False
39. 39.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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