Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 922 · 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 of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
2. 2.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
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 5 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
12. 12.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
23. 23.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
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 of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.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
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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