Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 560 · 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 use LED lamps wastes electricity. (a) True (b) False
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
10. 10.True or false: to switch off empty rooms saves electricity. (a) True (b) False
11. 11.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
12. 12.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
19. 19.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
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 6 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
22. 22.True or false: to leave the TV on standby saves electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
26. 26.True or false: to use LED lamps saves electricity. (a) True (b) False
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
37. 37.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
40. 40.True or false: to close the fridge quickly saves electricity. (a) False (b) True

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