Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 429 · 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 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
4. 4.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
9. 9.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
16. 16.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
23. 23.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
24. 24.True or false: to close the fridge quickly saves electricity. (a) False (b) True
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
27. 27.True or false: to leave the TV on standby wastes 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.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) close the fridge quickly
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
31. 31.🧾 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?
32. 32.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
38. 38.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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