Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 729 · 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 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
6. 6.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
9. 9.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
12. 12.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
14. 14.🧾 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?
15. 15.True or false: to close the fridge quickly saves electricity. (a) False (b) True
16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
20. 20.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

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