Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 856 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) close the fridge quickly (d) switch off empty rooms
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
7. 7.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
9. 9.🧾 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?
10. 10.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🧾 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
12. 12.True or false: to leave fridge door open wastes electricity. (a) False (b) True
13. 13.True or false: to use daylight to read saves electricity. (a) True (b) False
14. 14.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
16. 16.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
21. 21.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
23. 23.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves 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.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
32. 32.🧾 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?
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave fridge door open
36. 36.True or false: to leave the TV on standby saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 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?
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open

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