Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 886 · 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 family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs
5. 5.True or false: to use daylight to read wastes electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
7. 7.True or false: to close the fridge quickly saves electricity. (a) False (b) True
8. 8.True or false: to use LED lamps wastes electricity. (a) True (b) False
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
11. 11.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
17. 17.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) run fans in empty rooms
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 7 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
22. 22.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.True or false: to unplug idle chargers saves electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
26. 26.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
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 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 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?
33. 33.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.True or false: to use daylight to read saves electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
37. 37.True or false: to leave fridge door open wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
40. 40.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity

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