Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 313 · 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 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
6. 6.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
17. 17.True or false: to use old filament bulbs saves electricity. (a) False (b) True
18. 18.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) use old filament bulbs
22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
29. 29.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
30. 30.True or false: to use LED lamps saves electricity. (a) False (b) True
31. 31.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
32. 32.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🧾 A 75 W filament bulb is swapped for a 12 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 2 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 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?
37. 37.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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