Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 683 · 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 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.🧾 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
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
10. 10.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
12. 12.True or false: to close the fridge quickly saves electricity. (a) False (b) True
13. 13.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.True or false: to use daylight to read saves electricity. (a) False (b) True
15. 15.True or false: to use LED lamps wastes electricity. (a) False (b) True
16. 16.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
31. 31.🧾 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?
32. 32.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs

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