Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 598 · 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) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
3. 3.True or false: to use LED lamps wastes electricity. (a) False (b) True
4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
15. 15.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
17. 17.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
19. 19.True or false: to use LED lamps saves electricity. (a) True (b) False
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
22. 22.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
23. 23.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
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 8 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
32. 32.True or false: to leave fridge door open wastes electricity. (a) False (b) True
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
40. 40.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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