Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 830 · 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.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.True or false: to use old filament bulbs saves electricity. (a) False (b) True
4. 4.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
8. 8.True or false: to close the fridge quickly saves electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
13. 13.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
19. 19.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
21. 21.True or false: to use daylight to read saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
25. 25.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (d) use old filament bulbs
28. 28.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
34. 34.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
38. 38.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 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?

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