Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 795 · 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 leave the TV on standby wastes electricity. (a) False (b) True
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
5. 5.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
9. 9.True or false: to use LED lamps wastes electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
14. 14.🧾 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?
15. 15.🧾 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?
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
17. 17.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
29. 29.True or false: to switch off empty rooms saves electricity. (a) True (b) False
30. 30.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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