Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 938 · 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 set the AC to 24 °C wastes electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
5. 5.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
9. 9.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
11. 11.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
13. 13.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
14. 14.True or false: to use LED lamps wastes electricity. (a) False (b) True
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.True or false: to use old filament bulbs saves electricity. (a) True (b) False
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
25. 25.True or false: to close the fridge quickly saves electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
27. 27.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
31. 31.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
34. 34.🧾 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?
35. 35.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly

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