Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 907 · 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.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
2. 2.🧾 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
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 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?
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) use old filament bulbs
7. 7.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
10. 10.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
12. 12.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
13. 13.True or false: to use daylight to read saves electricity. (a) False (b) True
14. 14.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.True or false: to use old filament bulbs saves electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
20. 20.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
22. 22.🧾 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?
23. 23.True or false: to leave fridge door open wastes electricity. (a) False (b) True
24. 24.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
27. 27.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use old filament bulbs (d) use daylight to read
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
35. 35.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to use daylight to read wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) iron one shirt at a time

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