Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 960 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
4. 4.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) use daylight to read
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
6. 6.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
17. 17.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) use daylight to read
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to use LED lamps saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to unplug idle chargers saves electricity. (a) False (b) True
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 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?
36. 36.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
37. 37.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False

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