Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 797 · 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.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
3. 3.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
6. 6.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
7. 7.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use daylight to read saves electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
14. 14.True or false: to leave fridge door open wastes electricity. (a) True (b) False
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.True or false: to use daylight to read wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
21. 21.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
25. 25.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
29. 29.True or false: to use old filament bulbs saves electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
33. 33.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
37. 37.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
39. 39.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 fridge door open
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps

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