Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 816 · 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 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
4. 4.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
6. 6.🧾 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?
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
13. 13.True or false: to leave fridge door open saves electricity. (a) True (b) False
14. 14.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
22. 22.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) leave fridge door open
25. 25.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
31. 31.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.True or false: to use daylight to read saves electricity. (a) False (b) True
35. 35.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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