Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 721 · 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.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
7. 7.True or false: to use LED lamps saves electricity. (a) False (b) True
8. 8.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
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 8 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 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?
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) set the AC to 24 °C
17. 17.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
20. 20.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
26. 26.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
31. 31.🧾 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?
32. 32.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.True or false: to leave fridge door open saves electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
35. 35.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms

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