Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 849 · 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) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) set the AC to 24 °C
2. 2.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
8. 8.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
13. 13.True or false: to close the fridge quickly saves electricity. (a) True (b) False
14. 14.🧾 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?
15. 15.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 9 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (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
22. 22.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
23. 23.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
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 5 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
28. 28.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
36. 36.True or false: to use LED lamps saves electricity. (a) False (b) True
37. 37.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave the TV on standby
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
40. 40.🧾 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?

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