Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 930 · 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 switch off empty rooms wastes electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
3. 3.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
4. 4.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
11. 11.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
14. 14.🧾 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?
15. 15.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
21. 21.🔍 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
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 5 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
24. 24.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) close the fridge quickly (d) use LED lamps
25. 25.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🧾 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?
33. 33.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) iron one shirt at a time
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to use LED lamps saves electricity. (a) True (b) False

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