Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 533 · 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 lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
3. 3.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
17. 17.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
21. 21.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
22. 22.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) use old filament bulbs
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 4 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
31. 31.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
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
37. 37.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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