Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 966 · 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 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
6. 6.True or false: to use LED lamps wastes electricity. (a) False (b) True
7. 7.True or false: to close the fridge quickly saves electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
11. 11.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
12. 12.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) iron one shirt at a time
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.🧾 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
16. 16.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
18. 18.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
19. 19.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 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?
21. 21.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) unplug idle chargers (d) set the AC to 24 °C
26. 26.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.True or false: to leave fridge door open saves electricity. (a) False (b) True
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) iron one shirt at a time
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
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 4 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps

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