Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 969 · 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) use daylight to read (c) unplug idle chargers (d) close the fridge quickly
2. 2.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.🧾 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?
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use daylight to read
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
13. 13.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
15. 15.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
17. 17.🧾 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?
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
20. 20.True or false: to use old filament bulbs saves electricity. (a) True (b) False
21. 21.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
28. 28.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
30. 30.True or false: to use LED lamps saves electricity. (a) True (b) False
31. 31.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity

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