Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 980 · 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 10 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) unplug idle chargers
3. 3.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
7. 7.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
9. 9.True or false: to use daylight to read saves electricity. (a) False (b) True
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
11. 11.🧾 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?
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
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 2 hours. How many watt-hours (Wh) are saved?
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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 fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.True or false: to use old filament bulbs saves electricity. (a) False (b) True
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
32. 32.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms

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