Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 785 · 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 saves electricity. (a) True (b) False
2. 2.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
4. 4.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
23. 23.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) unplug idle chargers
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
26. 26.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
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 8 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) unplug idle chargers
34. 34.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
40. 40.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read

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