Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 268 · 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.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
3. 3.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) use old filament bulbs (d) iron one shirt at a time
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
13. 13.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to use daylight to read saves electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
19. 19.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
20. 20.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
24. 24.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
25. 25.True or false: to use daylight to read wastes electricity. (a) False (b) True
26. 26.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 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?
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 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?
39. 39.True or false: to unplug idle chargers saves electricity. (a) False (b) True
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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