Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 638 · 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) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
2. 2.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
3. 3.True or false: to use daylight to read saves electricity. (a) True (b) False
4. 4.🔍 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
5. 5.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
11. 11.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
14. 14.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) iron one shirt at a time
17. 17.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
18. 18.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
25. 25.🧾 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?
26. 26.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
27. 27.True or false: to leave the TV on standby saves electricity. (a) True (b) False
28. 28.True or false: to leave fridge door open saves electricity. (a) True (b) False
29. 29.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.🧾 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?
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to use LED lamps saves electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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