Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 74 · 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 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
7. 7.True or false: to leave fridge door open wastes electricity. (a) False (b) True
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
9. 9.🧾 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
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
13. 13.True or false: to leave the TV on standby saves electricity. (a) True (b) False
14. 14.True or false: to use daylight to read saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
18. 18.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
19. 19.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
22. 22.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
26. 26.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
29. 29.True or false: to leave fridge door open saves electricity. (a) False (b) True
30. 30.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
34. 34.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) unplug idle chargers
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms

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