Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 665 · 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 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🧾 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?
6. 6.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to use LED lamps wastes electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
17. 17.True or false: to use LED lamps saves electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
19. 19.True or false: to use daylight to read wastes electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
22. 22.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
23. 23.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
28. 28.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
35. 35.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
36. 36.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.True or false: to close the fridge quickly saves electricity. (a) True (b) False
40. 40.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) close the fridge quickly

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