Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 122 · 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.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.🧾 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?
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🧾 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?
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
17. 17.🧾 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
18. 18.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) use old filament bulbs
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
28. 28.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 1 hour. How many watt-hours (Wh) are saved?
32. 32.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
33. 33.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
37. 37.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
40. 40.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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