Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 644 · 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.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 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?
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.🧾 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
6. 6.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
15. 15.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) leave fridge door open
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
31. 31.True or false: to unplug idle chargers saves electricity. (a) False (b) True
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
34. 34.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
38. 38.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms

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