Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 349 · 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.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
3. 3.True or false: to use daylight to read wastes electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
14. 14.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
17. 17.True or false: to use daylight to read saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) iron one shirt at a time
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
22. 22.True or false: to use LED lamps saves electricity. (a) True (b) False
23. 23.True or false: to use LED lamps wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
26. 26.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
28. 28.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
29. 29.True or false: to switch off empty rooms saves electricity. (a) True (b) False
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.True or false: to use old filament bulbs saves electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
37. 37.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) unplug idle chargers
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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