Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 119 · 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) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
12. 12.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use daylight to read
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
17. 17.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) close the fridge quickly
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
19. 19.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave fridge door open
30. 30.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
34. 34.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. 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 3 hours. How many watt-hours (Wh) are saved?

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