Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 864 · 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 old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.True or false: to leave the TV on standby saves electricity. (a) True (b) False
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
16. 16.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
21. 21.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
29. 29.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
31. 31.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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