Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 659 · 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 is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
3. 3.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
5. 5.True or false: to leave fridge door open saves electricity. (a) True (b) False
6. 6.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
18. 18.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
19. 19.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
21. 21.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
24. 24.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
29. 29.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
35. 35.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
40. 40.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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