Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 56 · 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) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
5. 5.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
12. 12.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
18. 18.True or false: to unplug idle chargers saves electricity. (a) False (b) True
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
24. 24.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
27. 27.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.True or false: to use LED lamps wastes electricity. (a) False (b) True
33. 33.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
35. 35.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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