Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 334 · 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 family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.True or false: to use daylight to read wastes electricity. (a) True (b) False
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
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 10 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
12. 12.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
15. 15.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
17. 17.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🧾 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
26. 26.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (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.True or false: to switch off empty rooms saves electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
38. 38.True or false: to use old filament bulbs saves electricity. (a) False (b) True
39. 39.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers

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