Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 970 · 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 wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
2. 2.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
24. 24.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
25. 25.True or false: to close the fridge quickly saves electricity. (a) False (b) True
26. 26.True or false: to use LED lamps wastes electricity. (a) True (b) False
27. 27.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
29. 29.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
33. 33.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
34. 34.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
35. 35.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time

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