Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 127 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
8. 8.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
11. 11.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.True or false: to close the fridge quickly saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
20. 20.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) use LED lamps
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C
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 3 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
32. 32.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
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 6 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
40. 40.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) set the AC to 24 °C

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