Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 263 · 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) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
3. 3.🧾 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?
4. 4.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
7. 7.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 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?
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
13. 13.🧾 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?
14. 14.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.True or false: to leave fridge door open saves electricity. (a) False (b) True
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
23. 23.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.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
25. 25.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
28. 28.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
30. 30.True or false: to unplug idle chargers saves electricity. (a) False (b) True
31. 31.🧾 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?
32. 32.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
36. 36.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
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 family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity

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