Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 839 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
7. 7.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
9. 9.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
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 2 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
21. 21.True or false: to use LED lamps wastes electricity. (a) True (b) False
22. 22.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
30. 30.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
36. 36.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) set the AC to 24 °C
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
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.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity

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