Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 893 · 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 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?
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🧾 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?
6. 6.True or false: to unplug idle chargers saves electricity. (a) False (b) True
7. 7.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
9. 9.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
11. 11.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
13. 13.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
14. 14.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
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 4 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
35. 35.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to use daylight to read saves electricity. (a) False (b) True
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.True or false: to use LED lamps saves electricity. (a) False (b) True
39. 39.🧾 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?
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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