Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 556 · 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 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
5. 5.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
8. 8.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
10. 10.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
11. 11.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 60 W filament bulb is swapped for a 9 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 family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.True or false: to leave fridge door open wastes electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
18. 18.True or false: to unplug idle chargers saves electricity. (a) True (b) False
19. 19.True or false: to leave fridge door open saves electricity. (a) True (b) False
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.True or false: to use old filament bulbs saves electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
28. 28.True or false: to use daylight to read saves electricity. (a) True (b) False
29. 29.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
34. 34.🧾 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?
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
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 1 hour. How many watt-hours (Wh) are saved?
37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.🧾 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?
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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