Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 810 · 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.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
12. 12.True or false: to leave fridge door open saves electricity. (a) False (b) True
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
16. 16.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.🧾 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?
18. 18.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
20. 20.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to use daylight to read wastes electricity. (a) True (b) False
22. 22.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
34. 34.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
38. 38.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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