Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 437 · 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.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
6. 6.True or false: to use old filament bulbs saves electricity. (a) True (b) False
7. 7.🧾 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?
8. 8.🧾 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?
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) leave the TV on standby
10. 10.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 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?
12. 12.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
17. 17.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
20. 20.True or false: to unplug idle chargers saves electricity. (a) True (b) False
21. 21.True or false: to leave fridge door open wastes electricity. (a) True (b) False
22. 22.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
26. 26.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
30. 30.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
31. 31.True or false: to close the fridge quickly saves electricity. (a) False (b) True
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity

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