Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 220 · 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 iron one shirt at a time? (a) saves electricity (b) wastes electricity
2. 2.True or false: to use old filament bulbs saves electricity. (a) True (b) False
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
6. 6.🧾 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?
7. 7.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
9. 9.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
10. 10.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 3 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
29. 29.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 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?
32. 32.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 6 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
39. 39.🧾 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?
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

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