Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 841 · 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.True or false: to use daylight to read saves electricity. (a) False (b) True
2. 2.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
7. 7.True or false: to unplug idle chargers saves electricity. (a) True (b) False
8. 8.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
11. 11.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
14. 14.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
16. 16.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
17. 17.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
19. 19.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
20. 20.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
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 10 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.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
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 6 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
35. 35.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) use LED lamps
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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