Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 995 · 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 use daylight to read? (a) wastes electricity (b) saves electricity
2. 2.🧾 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?
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
5. 5.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
7. 7.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 6 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
13. 13.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) use daylight to read
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
16. 16.True or false: to use daylight to read saves electricity. (a) False (b) True
17. 17.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
18. 18.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) set the AC to 24 °C
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
27. 27.True or false: to unplug idle chargers saves electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
37. 37.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms

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