Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 989 · 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 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
9. 9.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
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 1 hour. How many watt-hours (Wh) are saved?
12. 12.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) set the AC to 24 °C
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
32. 32.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
34. 34.🧾 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?
35. 35.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
36. 36.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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