Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 340 · 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 close the fridge quickly wastes electricity. (a) True (b) False
2. 2.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
4. 4.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to leave fridge door open wastes electricity. (a) True (b) False
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
8. 8.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
11. 11.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
12. 12.True or false: to use daylight to read saves electricity. (a) False (b) True
13. 13.🔍 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 daylight to read
14. 14.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
15. 15.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
19. 19.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
22. 22.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
26. 26.True or false: to leave the TV on standby saves electricity. (a) True (b) False
27. 27.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
35. 35.True or false: to use daylight to read wastes electricity. (a) False (b) True
36. 36.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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