Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 1 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
6. 6.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
22. 22.True or false: to use daylight to read wastes electricity. (a) False (b) True
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
25. 25.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🧾 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?
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
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 10 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
38. 38.True or false: to use old filament bulbs saves electricity. (a) False (b) True
39. 39.🧾 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?
40. 40.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms

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