Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 67 · 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 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
3. 3.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
4. 4.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 250 W appliance runs for 8 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 ₹7. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
21. 21.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
27. 27.True or false: to leave the TV on standby saves electricity. (a) True (b) False
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
31. 31.🧾 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?
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) run fans in empty rooms
34. 34.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
35. 35.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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