Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 796 · 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.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
2. 2.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) set the AC to 24 °C
3. 3.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.True or false: to leave fridge door open saves electricity. (a) False (b) True
9. 9.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
11. 11.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
16. 16.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) switch off empty rooms
19. 19.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
20. 20.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
21. 21.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
26. 26.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
31. 31.🧾 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?
32. 32.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
38. 38.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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