Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 911 · 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.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
2. 2.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
4. 4.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
12. 12.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
17. 17.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 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?
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.🧾 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?
24. 24.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
29. 29.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
30. 30.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. 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 4 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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