Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 580 · 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 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
3. 3.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) close the fridge quickly
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
11. 11.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
20. 20.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
24. 24.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
27. 27.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
28. 28.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use LED lamps
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
32. 32.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
36. 36.True or false: to unplug idle chargers saves electricity. (a) True (b) False
37. 37.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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