Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 599 · 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 of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
8. 8.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
13. 13.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
21. 21.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) switch off empty rooms
23. 23.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.True or false: to switch off empty rooms saves electricity. (a) False (b) True
32. 32.🧾 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?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
39. 39.🧾 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?
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read

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