Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 32 · 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) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
2. 2.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
5. 5.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
10. 10.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
17. 17.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) set the AC to 24 °C (d) switch off empty rooms
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
20. 20.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms

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