Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 829 · 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 of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) iron one shirt at a time
2. 2.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) run fans in empty rooms
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
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 2 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
11. 11.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) close the fridge quickly
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
15. 15.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
18. 18.True or false: to close the fridge quickly saves electricity. (a) False (b) True
19. 19.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) iron one shirt at a time (d) run fans in empty rooms
20. 20.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
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 6 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
30. 30.True or false: to use daylight to read saves electricity. (a) False (b) True
31. 31.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to switch off empty rooms saves electricity. (a) False (b) True
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
39. 39.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
40. 40.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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