Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 688 · 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) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
6. 6.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
8. 8.True or false: to use old filament bulbs saves electricity. (a) True (b) False
9. 9.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
11. 11.True or false: to use LED lamps saves electricity. (a) False (b) True
12. 12.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
14. 14.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to unplug idle chargers saves electricity. (a) True (b) False
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
19. 19.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
30. 30.🧾 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?
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
34. 34.True or false: to use LED lamps wastes electricity. (a) True (b) False
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) unplug idle chargers

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