Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 190 · 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.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) unplug idle chargers
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
4. 4.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) run fans in empty rooms
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.True or false: to use old filament bulbs saves electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
12. 12.True or false: to leave fridge door open wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
15. 15.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
17. 17.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
18. 18.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
23. 23.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
25. 25.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
29. 29.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
32. 32.True or false: to leave fridge door open saves electricity. (a) False (b) True
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby

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