Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 943 · 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.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
4. 4.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
10. 10.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
12. 12.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
14. 14.True or false: to unplug idle chargers saves electricity. (a) False (b) True
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
17. 17.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 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?
23. 23.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
30. 30.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
31. 31.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
36. 36.True or false: to leave the TV on standby saves electricity. (a) False (b) True
37. 37.True or false: to switch off empty rooms saves electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to run fans in empty rooms saves electricity. (a) False (b) True

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