Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 201 · 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.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
3. 3.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
5. 5.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
6. 6.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
8. 8.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
10. 10.True or false: to close the fridge quickly saves electricity. (a) True (b) False
11. 11.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
13. 13.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use LED lamps
14. 14.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
15. 15.True or false: to use old filament bulbs saves electricity. (a) True (b) False
16. 16.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
22. 22.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
26. 26.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
30. 30.🧾 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?
31. 31.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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