Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 601 · 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 is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) use LED lamps (d) switch off empty rooms
2. 2.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
6. 6.True or false: to use old filament bulbs saves electricity. (a) False (b) True
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
10. 10.True or false: to use daylight to read wastes electricity. (a) False (b) True
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
13. 13.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
17. 17.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
18. 18.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
20. 20.🧾 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?
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
22. 22.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
23. 23.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
28. 28.🧾 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?
29. 29.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. 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 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
34. 34.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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