Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 867 · 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.True or false: to use LED lamps wastes electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
3. 3.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
5. 5.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
10. 10.True or false: to leave fridge door open wastes electricity. (a) False (b) True
11. 11.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
23. 23.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
25. 25.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
28. 28.🧾 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?
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
37. 37.🧾 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?
38. 38.True or false: to leave fridge door open saves electricity. (a) True (b) False
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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