Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 525 · 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 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
10. 10.🧾 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?
11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) use LED lamps
17. 17.True or false: to unplug idle chargers saves electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
20. 20.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) leave fridge door open
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
22. 22.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
25. 25.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
30. 30.True or false: to close the fridge quickly saves electricity. (a) False (b) True
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
38. 38.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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