Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 186 · 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 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
3. 3.🧾 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?
4. 4.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
6. 6.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
8. 8.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 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?
15. 15.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
21. 21.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
23. 23.True or false: to use daylight to read wastes electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
27. 27.True or false: to leave the TV on standby saves electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
30. 30.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
31. 31.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) unplug idle chargers (d) close the fridge quickly
37. 37.True or false: to use daylight to read saves electricity. (a) True (b) False
38. 38.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
40. 40.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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