Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 958 · 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 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?
2. 2.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) use daylight to read
4. 4.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
11. 11.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
13. 13.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
16. 16.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
18. 18.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
20. 20.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
21. 21.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to use LED lamps saves electricity. (a) False (b) True
23. 23.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
32. 32.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
38. 38.True or false: to leave fridge door open wastes electricity. (a) True (b) False
39. 39.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

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