Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 271 · 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.True or false: to close the fridge quickly saves electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
11. 11.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
12. 12.🧾 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?
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
23. 23.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
27. 27.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
29. 29.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
37. 37.True or false: to leave fridge door open saves electricity. (a) True (b) False
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
40. 40.🧾 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?

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