Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 529 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
8. 8.🧾 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
9. 9.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
13. 13.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.True or false: to use old filament bulbs saves electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
16. 16.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
18. 18.🧾 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?
19. 19.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
21. 21.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
22. 22.True or false: to leave the TV on standby saves electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
24. 24.🧾 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?
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
31. 31.True or false: to close the fridge quickly saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
33. 33.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms

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