Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 947 · 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.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
4. 4.True or false: to use old filament bulbs saves electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 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
12. 12.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
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.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
17. 17.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
20. 20.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) close the fridge quickly (d) set the AC to 24 °C
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
27. 27.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
36. 36.True or false: to leave fridge door open saves electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to leave the TV on standby saves electricity. (a) True (b) False

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