Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 597 · 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.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
3. 3.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
9. 9.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves 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 9 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.True or false: to use LED lamps wastes electricity. (a) True (b) False
20. 20.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
26. 26.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
28. 28.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity

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