Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 352 · 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 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
8. 8.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
11. 11.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.True or false: to use daylight to read wastes electricity. (a) True (b) False
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
16. 16.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
17. 17.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
21. 21.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
22. 22.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) close the fridge quickly (d) unplug idle chargers
23. 23.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
25. 25.True or false: to leave the TV on standby saves electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to unplug idle chargers saves electricity. (a) True (b) False
33. 33.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
35. 35.🧾 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?
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
38. 38.True or false: to leave fridge door open wastes electricity. (a) True (b) False
39. 39.True or false: to use daylight to read saves electricity. (a) True (b) False
40. 40.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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