Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 595 · 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 appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
4. 4.True or false: to use LED lamps saves electricity. (a) True (b) False
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
7. 7.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) set the AC to 24 °C
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🧾 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?
14. 14.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
18. 18.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
26. 26.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
30. 30.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time

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