Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 510 · 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.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.True or false: to unplug idle chargers saves electricity. (a) True (b) False
5. 5.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
7. 7.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
9. 9.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
10. 10.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
12. 12.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read saves electricity. (a) True (b) False
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
21. 21.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
27. 27.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.True or false: to leave fridge door open saves electricity. (a) False (b) True
33. 33.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
37. 37.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 40 W filament bulb is swapped for a 6 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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