Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 576 · 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 switch off empty rooms saves electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
4. 4.True or false: to use daylight to read saves electricity. (a) True (b) False
5. 5.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
12. 12.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
16. 16.🔍 Which is the odd one out? (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
17. 17.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
24. 24.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
27. 27.True or false: to leave the TV on standby saves electricity. (a) False (b) True
28. 28.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) use daylight to read
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
38. 38.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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