Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 181 · 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.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
2. 2.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
3. 3.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 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
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
12. 12.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
13. 13.True or false: to close the fridge quickly saves electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
24. 24.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
31. 31.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
34. 34.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to leave fridge door open saves electricity. (a) False (b) True
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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