Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 551 · 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.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
2. 2.True or false: to use daylight to read saves electricity. (a) True (b) False
3. 3.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
4. 4.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
7. 7.True or false: to leave the TV on standby saves electricity. (a) False (b) True
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
12. 12.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 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
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
17. 17.True or false: to use LED lamps saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
20. 20.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.True or false: to leave fridge door open wastes electricity. (a) True (b) False
28. 28.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
31. 31.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
35. 35.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 3 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read

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