Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 116 · 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) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
3. 3.True or false: to close the fridge quickly saves electricity. (a) False (b) True
4. 4.True or false: to switch off empty rooms saves electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
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 1 hour. How many watt-hours (Wh) are saved?
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
15. 15.True or false: to use LED lamps saves electricity. (a) True (b) False
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
21. 21.True or false: to use daylight to read wastes electricity. (a) False (b) True
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
29. 29.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
30. 30.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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