Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 511 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
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.True or false: to use LED lamps wastes electricity. (a) False (b) True
4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
5. 5.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
10. 10.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
22. 22.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
24. 24.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
26. 26.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
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 9 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps

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