Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 948 · 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 is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
2. 2.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
7. 7.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
8. 8.🧾 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?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
13. 13.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
20. 20.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) close the fridge quickly
21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
23. 23.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
29. 29.True or false: to close the fridge quickly saves electricity. (a) True (b) False
30. 30.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
33. 33.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
36. 36.True or false: to leave the TV on standby saves electricity. (a) True (b) False
37. 37.True or false: to use LED lamps saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
39. 39.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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