Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 111 · 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) use LED lamps (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
3. 3.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.True or false: to use daylight to read saves electricity. (a) True (b) False
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
11. 11.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.True or false: to use LED lamps wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
17. 17.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
22. 22.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
24. 24.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
35. 35.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to use LED lamps saves electricity. (a) True (b) False

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