Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 492 · 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 unplug idle chargers? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
5. 5.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
9. 9.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
16. 16.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to switch off empty rooms saves electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to use LED lamps saves electricity. (a) True (b) False
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
25. 25.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
26. 26.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
32. 32.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs

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