Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 109 · 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) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
4. 4.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
5. 5.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
9. 9.True or false: to unplug idle chargers saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
12. 12.True or false: to leave fridge door open saves electricity. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
14. 14.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
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 1 hour. How many watt-hours (Wh) are saved?
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use LED lamps (d) unplug idle chargers
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
37. 37.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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