Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 365 · 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 use daylight to read? (a) wastes electricity (b) saves electricity
2. 2.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
4. 4.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
5. 5.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time
7. 7.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to use LED lamps wastes electricity. (a) True (b) False
9. 9.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to leave fridge door open saves electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) close the fridge quickly
13. 13.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
18. 18.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.🧾 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?
22. 22.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
23. 23.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 1 hour. How many watt-hours (Wh) are saved?
27. 27.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
28. 28.🧾 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?
29. 29.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
37. 37.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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