Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 112 · 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 close the fridge quickly? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
3. 3.True or false: to use LED lamps saves electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) leave fridge door open
5. 5.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) use old filament bulbs
9. 9.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) use LED lamps
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
15. 15.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 170 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) saves electricity (b) wastes electricity
20. 20.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
23. 23.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
25. 25.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) iron one shirt at a time (d) close the fridge quickly
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.True or false: to use daylight to read wastes electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
32. 32.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
36. 36.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time

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