Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 778 · 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 is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
3. 3.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) unplug idle chargers
4. 4.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) unplug idle chargers (d) switch off empty rooms
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave fridge door open saves electricity. (a) True (b) False
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
15. 15.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
18. 18.True or false: to use LED lamps saves electricity. (a) False (b) True
19. 19.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
20. 20.True or false: to use daylight to read saves electricity. (a) True (b) False
21. 21.🧾 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?
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
30. 30.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
32. 32.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
33. 33.🧾 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?
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
35. 35.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
38. 38.True or false: to use daylight to read wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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