Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 904 · 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 is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
2. 2.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) close the fridge quickly
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
6. 6.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
15. 15.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
20. 20.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
24. 24.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
28. 28.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
31. 31.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
32. 32.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
34. 34.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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