Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 225 · 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 family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
6. 6.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
8. 8.🧾 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?
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
10. 10.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
13. 13.🧾 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?
14. 14.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
20. 20.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
24. 24.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) leave fridge door open (d) run fans in empty rooms
29. 29.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) set the AC to 24 °C
34. 34.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
36. 36.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
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.True or false: to use daylight to read saves electricity. (a) False (b) True

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