Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 562 · 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 of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
8. 8.🧾 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?
9. 9.🔍 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
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
11. 11.True or false: to close the fridge quickly saves electricity. (a) True (b) False
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
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 2 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to switch off empty rooms saves electricity. (a) True (b) False
21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
26. 26.🧾 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?
27. 27.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) set the AC to 24 °C
29. 29.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
39. 39.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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