Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 747 · 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 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
4. 4.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
7. 7.True or false: to unplug idle chargers saves electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
9. 9.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
15. 15.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.True or false: to close the fridge quickly saves electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
21. 21.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
23. 23.🧾 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?
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) unplug idle chargers
26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave fridge door open wastes electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
33. 33.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
34. 34.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.True or false: to use LED lamps saves electricity. (a) True (b) False
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity

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