Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 262 · 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.True or false: to switch off empty rooms saves electricity. (a) False (b) True
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
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 saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
11. 11.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
12. 12.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
18. 18.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
19. 19.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
21. 21.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
24. 24.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
27. 27.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
34. 34.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
37. 37.True or false: to leave the TV on standby saves electricity. (a) True (b) False
38. 38.🧾 A 1000 W appliance runs for 10 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 7 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps

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