Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 957 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
3. 3.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
4. 4.True or false: to switch off empty rooms saves electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
6. 6.True or false: to leave the TV on standby saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
8. 8.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
9. 9.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.True or false: to use daylight to read saves electricity. (a) True (b) False
15. 15.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
16. 16.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) use daylight to read
21. 21.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) run fans in empty rooms
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
31. 31.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
34. 34.🧾 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?
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) close the fridge quickly
36. 36.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
38. 38.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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