Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 384 · 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 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
2. 2.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
6. 6.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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?
8. 8.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
12. 12.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) unplug idle chargers
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
21. 21.🧾 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
22. 22.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
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 8 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.True or false: to leave the TV on standby saves electricity. (a) True (b) False
37. 37.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

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