Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 388 · 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 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.🧾 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?
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 1 hour. How many watt-hours (Wh) are saved?
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
7. 7.True or false: to use LED lamps saves electricity. (a) False (b) True
8. 8.🧾 A 60 W filament bulb is swapped for a 9 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 family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
11. 11.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
16. 16.🧾 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
17. 17.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
19. 19.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
21. 21.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) leave the TV on standby
22. 22.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
25. 25.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.True or false: to close the fridge quickly saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.True or false: to unplug idle chargers saves electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
34. 34.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
35. 35.True or false: to use old filament bulbs saves electricity. (a) False (b) True
36. 36.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
40. 40.True or false: to leave the TV on standby wastes electricity. (a) False (b) True

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