Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 273 · 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.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
8. 8.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.True or false: to use LED lamps saves electricity. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
22. 22.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
27. 27.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
28. 28.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
34. 34.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.True or false: to close the fridge quickly saves electricity. (a) False (b) True
38. 38.🧾 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?
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.True or false: to unplug idle chargers saves electricity. (a) True (b) False

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