Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 834 · 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.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
10. 10.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
11. 11.True or false: to leave the TV on standby saves electricity. (a) False (b) True
12. 12.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
14. 14.True or false: to use daylight to read wastes electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 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
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.True or false: to use old filament bulbs saves electricity. (a) False (b) True
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
26. 26.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
29. 29.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
30. 30.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 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?
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use daylight to read saves electricity. (a) True (b) False

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