Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 944 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
3. 3.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
4. 4.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
5. 5.🧾 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?
6. 6.True or false: to leave fridge door open wastes electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.True or false: to leave fridge door open saves electricity. (a) False (b) True
10. 10.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
12. 12.🧾 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?
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
15. 15.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
17. 17.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
26. 26.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
29. 29.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
30. 30.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
31. 31.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to use LED lamps saves electricity. (a) True (b) False
33. 33.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
35. 35.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
39. 39.True or false: to use daylight to read wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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