Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 86 · 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 use daylight to read saves electricity. (a) False (b) True
2. 2.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
6. 6.True or false: to use LED lamps saves electricity. (a) True (b) False
7. 7.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.🧾 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?
11. 11.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
16. 16.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
25. 25.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
27. 27.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
28. 28.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
31. 31.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
36. 36.🧾 A family uses 150 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 4 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps

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