Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 63 · 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 lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
6. 6.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
10. 10.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
13. 13.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
21. 21.True or false: to leave fridge door open saves electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
28. 28.True or false: to switch off empty rooms saves electricity. (a) True (b) False
29. 29.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
34. 34.True or false: to leave fridge door open wastes electricity. (a) False (b) True
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 3 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time

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