Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 14 · 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 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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?
4. 4.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) use LED lamps
16. 16.🧾 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?
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
21. 21.🔍 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
22. 22.True or false: to leave the TV on standby saves electricity. (a) True (b) False
23. 23.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to close the fridge quickly saves electricity. (a) False (b) True
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
32. 32.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
33. 33.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
36. 36.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
38. 38.True or false: to use old filament bulbs saves electricity. (a) True (b) False
39. 39.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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