Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 188 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
2. 2.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
7. 7.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
9. 9.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
12. 12.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
21. 21.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 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?
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
35. 35.True or false: to leave fridge door open wastes electricity. (a) False (b) True
36. 36.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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