Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 133 · 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) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
3. 3.True or false: to use daylight to read wastes electricity. (a) False (b) True
4. 4.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
6. 6.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
7. 7.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.True or false: to leave fridge door open wastes electricity. (a) True (b) False
12. 12.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
19. 19.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 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 fridge door open
24. 24.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
25. 25.True or false: to use LED lamps wastes electricity. (a) True (b) False
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
35. 35.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
40. 40.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers

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