Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 64 · 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 wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
2. 2.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
3. 3.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
6. 6.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
13. 13.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
15. 15.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
20. 20.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
22. 22.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
28. 28.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
32. 32.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) close the fridge quickly (d) unplug idle chargers
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
39. 39.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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