Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 197 · 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 fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
4. 4.True or false: to unplug idle chargers saves electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) set the AC to 24 °C
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
9. 9.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
11. 11.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
17. 17.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
18. 18.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
22. 22.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
27. 27.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
29. 29.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 1 hour. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) leave fridge door open (d) use old filament bulbs
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A 1500 W appliance runs for 2 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) iron one shirt at a time (c) use daylight to read (d) use LED lamps
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

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