Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 517 · 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 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
5. 5.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
11. 11.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) use daylight to read
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 5 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
16. 16.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
17. 17.True or false: to switch off empty rooms saves electricity. (a) False (b) True
18. 18.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) leave fridge door open
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) close the fridge quickly
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
25. 25.True or false: to use LED lamps saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.🧾 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?
31. 31.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
32. 32.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
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 4 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to leave fridge door open wastes electricity. (a) True (b) False
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open

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