Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 894 · 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 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
4. 4.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to switch off empty rooms saves electricity. (a) False (b) True
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
20. 20.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 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?
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.True or false: to leave fridge door open wastes electricity. (a) True (b) False
24. 24.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.🧾 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?
34. 34.🧾 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?
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
37. 37.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use LED lamps (d) close the fridge quickly
38. 38.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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