Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 682 · 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 10 hours. How many watt-hours (Wh) are saved?
2. 2.True or false: to use daylight to read saves electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
11. 11.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.True or false: to use LED lamps wastes electricity. (a) False (b) True
14. 14.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
15. 15.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms
16. 16.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
28. 28.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
29. 29.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
31. 31.True or false: to leave the TV on standby saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 8 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
37. 37.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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