Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 266 · 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 iron one shirt at a time wastes electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
7. 7.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
13. 13.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
27. 27.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
31. 31.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
34. 34.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
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 10 hours. How many watt-hours (Wh) are saved?
40. 40.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly

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