Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 918 · 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 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
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 5 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
9. 9.True or false: to use old filament bulbs saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
14. 14.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
18. 18.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
21. 21.True or false: to leave fridge door open saves electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
23. 23.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
24. 24.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to close the fridge quickly saves electricity. (a) False (b) True
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 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?
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C

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