Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 620 · 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 is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
2. 2.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
6. 6.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
15. 15.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
18. 18.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
20. 20.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
24. 24.True or false: to use LED lamps saves electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
26. 26.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
27. 27.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
30. 30.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
32. 32.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) run fans in empty rooms
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 5 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
38. 38.True or false: to unplug idle chargers saves electricity. (a) True (b) False
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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