Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 450 · 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.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
4. 4.True or false: to use daylight to read saves electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) unplug idle chargers
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) use old filament bulbs
18. 18.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
20. 20.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
25. 25.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) switch off empty rooms
26. 26.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
28. 28.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
32. 32.True or false: to use daylight to read wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
34. 34.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) switch off empty rooms
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity

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