Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 853 · 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 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
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
3. 3.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.True or false: to leave fridge door open saves electricity. (a) False (b) True
6. 6.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
7. 7.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) switch off empty rooms (d) close the fridge quickly
9. 9.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
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 9 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
15. 15.🧾 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?
16. 16.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
25. 25.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.True or false: to use old filament bulbs saves electricity. (a) False (b) True
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
34. 34.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
37. 37.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
40. 40.True or false: to close the fridge quickly saves electricity. (a) False (b) True

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