Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 58 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to leave the TV on standby saves electricity. (a) True (b) False
4. 4.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
7. 7.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
10. 10.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
12. 12.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) use LED lamps
14. 14.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
17. 17.🧾 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?
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
19. 19.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
30. 30.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
34. 34.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
36. 36.True or false: to use old filament bulbs saves electricity. (a) True (b) False
37. 37.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
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 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp

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