Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 414 · 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 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
11. 11.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
12. 12.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
22. 22.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
28. 28.True or false: to close the fridge quickly saves electricity. (a) False (b) True
29. 29.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) run fans in empty rooms (d) close the fridge quickly
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
33. 33.True or false: to leave fridge door open saves electricity. (a) True (b) False
34. 34.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
35. 35.True or false: to switch off empty rooms saves electricity. (a) True (b) False
36. 36.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
38. 38.True or false: to unplug idle chargers saves electricity. (a) False (b) True
39. 39.True or false: to use old filament bulbs saves electricity. (a) True (b) False
40. 40.True or false: to run fans in empty rooms saves electricity. (a) False (b) True

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