Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 136 · 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) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
7. 7.🧾 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?
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
10. 10.🧾 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?
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
12. 12.🧾 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?
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read saves electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
18. 18.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
21. 21.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
22. 22.🔍 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
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
27. 27.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave the TV on standby
37. 37.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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