Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 302 · 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) False (b) True
2. 2.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
6. 6.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
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 2 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
18. 18.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
19. 19.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
21. 21.🧾 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?
22. 22.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.True or false: to use old filament bulbs saves electricity. (a) False (b) True
28. 28.True or false: to leave the TV on standby 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.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
31. 31.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.🧾 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?
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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