Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 390 · 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) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
2. 2.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
4. 4.True or false: to use LED lamps wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
6. 6.True or false: to switch off empty rooms saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
15. 15.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
19. 19.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
20. 20.True or false: to use daylight to read saves electricity. (a) False (b) True
21. 21.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
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 5 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
28. 28.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to use LED lamps saves electricity. (a) False (b) True
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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