Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 809 · 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 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
3. 3.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
7. 7.True or false: to close the fridge quickly saves electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
20. 20.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
25. 25.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
30. 30.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
33. 33.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 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?
35. 35.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs

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