Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 50 · 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 leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.True or false: to leave fridge door open wastes electricity. (a) False (b) True
3. 3.🧾 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
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
5. 5.True or false: to unplug idle chargers saves electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
7. 7.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
12. 12.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
19. 19.True or false: to use daylight to read saves electricity. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
23. 23.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) run fans in 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 2 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
30. 30.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
37. 37.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
38. 38.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps

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