Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 379 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
2. 2.True or false: to use LED lamps saves electricity. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
5. 5.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
9. 9.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
21. 21.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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