Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 499 · 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 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.🧾 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?
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
6. 6.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
9. 9.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to use daylight to read saves electricity. (a) False (b) True
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 3 hours. How many watt-hours (Wh) are saved?
14. 14.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.True or false: to leave the TV on standby saves electricity. (a) False (b) True
32. 32.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs

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