Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 687 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.True or false: to close the fridge quickly saves electricity. (a) False (b) True
3. 3.True or false: to use LED lamps wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
6. 6.True or false: to unplug idle chargers saves electricity. (a) False (b) True
7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
10. 10.🧾 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
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) unplug idle chargers
13. 13.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
19. 19.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.True or false: to leave fridge door open wastes electricity. (a) True (b) False
30. 30.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to use old filament bulbs saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
35. 35.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
36. 36.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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