Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 578 · 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.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.True or false: to leave the TV on standby saves electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
11. 11.🔍 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
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
14. 14.True or false: to use daylight to read saves electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) close the fridge quickly
16. 16.🧾 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?
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
22. 22.True or false: to use old filament bulbs saves electricity. (a) True (b) False
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
25. 25.True or false: to close the fridge quickly saves electricity. (a) True (b) False
26. 26.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
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 4 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) leave fridge door open

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