Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 508 · 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 200 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 10 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.🧾 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
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
13. 13.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
19. 19.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.True or false: to use daylight to read wastes electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
30. 30.True or false: to close the fridge quickly saves electricity. (a) True (b) False
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.True or false: to use LED lamps saves electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
38. 38.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity

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