Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 84 · 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.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
5. 5.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
11. 11.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use daylight to read (d) unplug idle chargers
12. 12.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
19. 19.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
20. 20.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
26. 26.True or false: to use daylight to read wastes electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
29. 29.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 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?

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