Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 671 · 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 lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
2. 2.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
4. 4.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
9. 9.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
17. 17.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
22. 22.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to use LED lamps wastes electricity. (a) True (b) False
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
26. 26.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
29. 29.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
30. 30.True or false: to switch off empty rooms saves electricity. (a) True (b) False
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
32. 32.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) unplug idle chargers
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
40. 40.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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