Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 952 · 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 is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
2. 2.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
5. 5.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.True or false: to leave fridge door open wastes electricity. (a) False (b) True
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
10. 10.🧾 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
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
17. 17.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
23. 23.🧾 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?
24. 24.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
25. 25.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
27. 27.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to unplug idle chargers saves electricity. (a) False (b) True
29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
31. 31.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
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) set the AC to 24 °C
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
39. 39.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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