Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 149 · 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 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 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
3. 3.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.🧾 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?
5. 5.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
6. 6.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
10. 10.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
12. 12.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
15. 15.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 daylight to read
16. 16.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
21. 21.True or false: to use daylight to read wastes electricity. (a) False (b) True
22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
29. 29.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave fridge door open
31. 31.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
35. 35.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
39. 39.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms

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