Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 528 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
3. 3.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
6. 6.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
11. 11.True or false: to use LED lamps saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
16. 16.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.True or false: to leave fridge door open saves electricity. (a) False (b) True
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.True or false: to leave fridge door open wastes electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
32. 32.True or false: to switch off empty rooms saves electricity. (a) True (b) False
33. 33.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms

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