Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 146 · 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 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
3. 3.🧾 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?
4. 4.🧾 A family uses 160 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 iron one shirt at a time? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
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) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
17. 17.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
20. 20.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
25. 25.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
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 iron one shirt at a time wastes electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
39. 39.True or false: to use LED lamps wastes electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms

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