Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 62 · 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 lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
2. 2.True or false: to switch off empty rooms saves electricity. (a) True (b) False
3. 3.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
6. 6.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
8. 8.🧾 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?
9. 9.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
11. 11.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
18. 18.True or false: to use daylight to read wastes electricity. (a) True (b) False
19. 19.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
20. 20.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to close the fridge quickly saves electricity. (a) False (b) True
22. 22.True or false: to use old filament bulbs saves electricity. (a) False (b) True
23. 23.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.True or false: to use LED lamps wastes electricity. (a) False (b) True
26. 26.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
28. 28.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
29. 29.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.🧾 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?
38. 38.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.True or false: to unplug idle chargers wastes electricity. (a) False (b) True

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