Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 487 · 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) use daylight to read (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
2. 2.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
3. 3.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
11. 11.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
20. 20.🧾 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?
21. 21.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.True or false: to close the fridge quickly saves electricity. (a) False (b) True
28. 28.True or false: to use old filament bulbs saves electricity. (a) False (b) True
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) close the fridge quickly
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs

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