Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 736 · 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.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
3. 3.True or false: to use LED lamps saves electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
13. 13.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
15. 15.True or false: to use daylight to read wastes electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
18. 18.True or false: to leave fridge door open saves electricity. (a) True (b) False
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) use daylight to read (d) close the fridge quickly
24. 24.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
26. 26.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
34. 34.True or false: to iron one shirt at a time saves 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.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly

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