Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 555 · 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 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to use LED lamps wastes electricity. (a) True (b) False
3. 3.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 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?
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) unplug idle chargers
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.True or false: to use daylight to read wastes electricity. (a) True (b) False
9. 9.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
10. 10.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
17. 17.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
22. 22.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to use old filament bulbs saves electricity. (a) False (b) True
24. 24.True or false: to switch off empty rooms saves electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
26. 26.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
31. 31.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
40. 40.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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