Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 971 · 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 run fans in empty rooms? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
7. 7.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
11. 11.🧾 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?
12. 12.True or false: to leave the TV on standby saves electricity. (a) True (b) False
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
16. 16.True or false: to unplug idle chargers saves electricity. (a) True (b) False
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
21. 21.True or false: to leave fridge door open wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.🧾 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?
26. 26.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
29. 29.True or false: to switch off empty rooms saves electricity. (a) False (b) True
30. 30.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
39. 39.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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