Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 899 · 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) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
3. 3.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
6. 6.True or false: to leave fridge door open saves electricity. (a) False (b) True
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
9. 9.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.True or false: to unplug idle chargers saves electricity. (a) True (b) False
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) use daylight to read
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 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
23. 23.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) unplug idle chargers (d) close the fridge quickly
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
34. 34.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
36. 36.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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