Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 526 · 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 close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.True or false: to use daylight to read wastes electricity. (a) True (b) False
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
7. 7.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.True or false: to use LED lamps saves electricity. (a) True (b) False
11. 11.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.True or false: to use LED lamps wastes electricity. (a) True (b) False
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 daylight to read? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.True or false: to use daylight to read saves electricity. (a) False (b) True
17. 17.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
21. 21.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) leave the TV on standby
23. 23.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 the TV on standby
24. 24.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
25. 25.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
26. 26.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to use old filament bulbs saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
31. 31.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
32. 32.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 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?
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
37. 37.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
38. 38.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers

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