Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 685 · 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 set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
5. 5.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 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
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
12. 12.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
16. 16.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 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?
18. 18.🧾 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?
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
23. 23.True or false: to use LED lamps wastes electricity. (a) False (b) True
24. 24.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
25. 25.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
33. 33.🧾 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?
34. 34.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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