Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 180 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
2. 2.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to leave the TV on standby saves electricity. (a) True (b) False
6. 6.🧾 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
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
8. 8.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
9. 9.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 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?
14. 14.True or false: to use LED lamps saves electricity. (a) True (b) False
15. 15.🧾 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?
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 1 hour. How many watt-hours (Wh) are saved?
17. 17.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
22. 22.True or false: to use daylight to read wastes electricity. (a) True (b) False
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
33. 33.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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