Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 912 · 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 8 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
3. 3.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
14. 14.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
19. 19.🧾 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?
20. 20.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
23. 23.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
25. 25.True or false: to unplug idle chargers saves electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.True or false: to use daylight to read saves electricity. (a) True (b) False
31. 31.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
34. 34.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
40. 40.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms

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