Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 125 · 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 use LED lamps saves electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
8. 8.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) use daylight to read
9. 9.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) switch off empty rooms
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.🧾 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?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
17. 17.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
25. 25.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🧾 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?
27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
28. 28.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
33. 33.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
38. 38.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 4 hours. How many watt-hours (Wh) are saved?

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