Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 478 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.True or false: to leave fridge door open wastes electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
6. 6.🧾 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?
7. 7.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to switch off empty rooms saves electricity. (a) False (b) True
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
15. 15.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
19. 19.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) use LED lamps
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.True or false: to use LED lamps saves electricity. (a) False (b) True
24. 24.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
26. 26.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
28. 28.🔍 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) use daylight to read
29. 29.True or false: to leave the TV on standby saves electricity. (a) True (b) False
30. 30.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
37. 37.True or false: to close the fridge quickly saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
39. 39.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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