Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 113 · 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.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
5. 5.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
16. 16.True or false: to leave fridge door open saves electricity. (a) False (b) True
17. 17.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 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?
19. 19.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) use old filament bulbs (d) iron one shirt at a time
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
21. 21.🧾 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?
22. 22.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
32. 32.🧾 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?
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
34. 34.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
40. 40.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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