Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 866 · 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 of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
3. 3.🧾 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?
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
5. 5.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
16. 16.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 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?
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
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 7 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
27. 27.🔍 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
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
30. 30.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to use LED lamps wastes electricity. (a) False (b) True
35. 35.True or false: to use daylight to read wastes electricity. (a) True (b) False
36. 36.True or false: to leave the TV on standby saves electricity. (a) False (b) True
37. 37.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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