Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 619 · 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) an LED lamp (c) a candle (d) an oil lamp
2. 2.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
3. 3.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
7. 7.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
8. 8.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
11. 11.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
14. 14.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to close the fridge quickly saves electricity. (a) False (b) True
16. 16.True or false: to use daylight to read wastes electricity. (a) False (b) True
17. 17.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to use daylight to read saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
22. 22.True or false: to use old filament bulbs saves electricity. (a) True (b) False
23. 23.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) close the fridge quickly
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
32. 32.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
35. 35.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
38. 38.🧾 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?
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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