Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 110 · 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.True or false: to use daylight to read saves electricity. (a) True (b) False
2. 2.🧾 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?
3. 3.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
5. 5.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
12. 12.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
13. 13.True or false: to leave the TV on standby saves electricity. (a) True (b) False
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 saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
17. 17.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
18. 18.True or false: to switch off empty rooms saves electricity. (a) True (b) False
19. 19.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
21. 21.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
22. 22.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
27. 27.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 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?
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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