Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 827 · 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.True or false: to leave the TV on standby saves electricity. (a) False (b) True
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
3. 3.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.True or false: to use daylight to read saves electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
7. 7.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to leave fridge door open saves electricity. (a) False (b) True
9. 9.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
10. 10.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
13. 13.True or false: to leave fridge door open wastes electricity. (a) True (b) False
14. 14.True or false: to close the fridge quickly saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
18. 18.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
20. 20.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) iron one shirt at a time
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
27. 27.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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