Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 514 · 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 unplug idle chargers? (a) saves electricity (b) wastes electricity
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
9. 9.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.True or false: to close the fridge quickly saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
13. 13.True or false: to unplug idle chargers saves electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
19. 19.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
22. 22.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
23. 23.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
24. 24.True or false: to use daylight to read wastes electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
31. 31.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) use LED lamps
33. 33.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
36. 36.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity

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