Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 935 · 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 is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) set the AC to 24 °C (d) use daylight to read
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
6. 6.🧾 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?
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
11. 11.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
15. 15.True or false: to leave the TV on standby saves electricity. (a) True (b) False
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
17. 17.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
20. 20.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.True or false: to close the fridge quickly saves electricity. (a) False (b) True
36. 36.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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