Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 622 · 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) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
2. 2.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to use daylight to read wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to use LED lamps wastes electricity. (a) True (b) False
8. 8.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
11. 11.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use LED lamps saves electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) close the fridge quickly
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
17. 17.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
18. 18.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.True or false: to leave fridge door open saves electricity. (a) True (b) False
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
35. 35.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
40. 40.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps

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