Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 661 · 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 leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
3. 3.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
4. 4.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
6. 6.🧾 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?
7. 7.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.True or false: to use LED lamps saves electricity. (a) False (b) True
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
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 10 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
15. 15.True or false: to leave fridge door open wastes electricity. (a) False (b) True
16. 16.True or false: to use daylight to read wastes electricity. (a) True (b) False
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.True or false: to close the fridge quickly saves electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
20. 20.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
22. 22.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) close the fridge quickly
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
26. 26.True or false: to leave fridge door open saves electricity. (a) True (b) False
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
33. 33.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to switch off empty rooms saves electricity. (a) False (b) True
36. 36.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.True or false: to leave the TV on standby saves electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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