Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 817 · 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 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to unplug idle chargers saves electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
4. 4.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
7. 7.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use LED lamps (d) set the AC to 24 °C
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
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 4 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
15. 15.🧾 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
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
25. 25.True or false: to use daylight to read wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) close the fridge quickly
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 9 hours. How many watt-hours (Wh) are saved?
29. 29.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
30. 30.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
35. 35.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?

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