Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 615 · 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 of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) use daylight to read
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
10. 10.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
13. 13.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
14. 14.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
16. 16.True or false: to leave fridge door open wastes electricity. (a) False (b) True
17. 17.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
21. 21.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
23. 23.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
33. 33.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

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