Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 701 · 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 is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
7. 7.True or false: to use old filament bulbs saves electricity. (a) True (b) False
8. 8.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
9. 9.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
12. 12.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) switch off empty rooms
15. 15.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
20. 20.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to use daylight to read saves electricity. (a) True (b) False
23. 23.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.True or false: to use LED lamps saves electricity. (a) False (b) True
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
38. 38.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms

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