Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 477 · 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 family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
6. 6.🧾 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?
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.🧾 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?
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
12. 12.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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.True or false: to leave fridge door open saves electricity. (a) True (b) False
23. 23.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to leave fridge door open wastes electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
26. 26.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) unplug idle chargers (d) use LED lamps
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
36. 36.True or false: to close the fridge quickly saves electricity. (a) False (b) True
37. 37.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms

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