Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 909 · 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 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
6. 6.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
10. 10.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
14. 14.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
17. 17.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
26. 26.True or false: to close the fridge quickly saves electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) unplug idle chargers
28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
29. 29.🧾 A family uses 170 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) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
36. 36.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity

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