Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 359 · 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 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?
2. 2.True or false: to use LED lamps saves electricity. (a) False (b) True
3. 3.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to leave fridge door open saves electricity. (a) False (b) True
5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
6. 6.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
21. 21.🧾 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?
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 10 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
26. 26.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
28. 28.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
33. 33.True or false: to unplug idle chargers saves electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms

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