Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 75 · 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 lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
2. 2.True or false: to close the fridge quickly saves electricity. (a) True (b) False
3. 3.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
4. 4.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
13. 13.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
15. 15.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
18. 18.True or false: to use LED lamps saves electricity. (a) True (b) False
19. 19.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
24. 24.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 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?
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
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 5 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs

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