Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 178 · 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 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
4. 4.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) use LED lamps
8. 8.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
10. 10.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
12. 12.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
16. 16.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
18. 18.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
22. 22.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
23. 23.🧾 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?
24. 24.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
32. 32.🔍 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) run fans in empty rooms
33. 33.True or false: to leave the TV on standby saves electricity. (a) True (b) False
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.True or false: to unplug idle chargers saves electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
38. 38.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
39. 39.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
40. 40.True or false: to close the fridge quickly saves electricity. (a) True (b) False

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