Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 4 · 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.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
11. 11.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 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?
18. 18.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) switch off empty rooms
19. 19.True or false: to switch off empty rooms saves electricity. (a) True (b) False
20. 20.True or false: to use daylight to read wastes electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
22. 22.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
24. 24.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
26. 26.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to unplug idle chargers saves electricity. (a) False (b) True
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.True or false: to leave fridge door open saves electricity. (a) False (b) True
31. 31.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
32. 32.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
35. 35.True or false: to close the fridge quickly saves electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
37. 37.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
38. 38.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 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?
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity

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