Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 635 · 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 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
5. 5.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
13. 13.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) switch off empty rooms
17. 17.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
19. 19.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
22. 22.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
25. 25.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.True or false: to switch off empty rooms saves electricity. (a) False (b) True
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to use daylight to read wastes electricity. (a) False (b) True
37. 37.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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