Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 335 · 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.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 10 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
11. 11.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to use daylight to read saves electricity. (a) True (b) False
13. 13.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 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?
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.True or false: to switch off empty rooms saves electricity. (a) False (b) True
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) run fans in empty rooms
28. 28.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
35. 35.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
36. 36.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
39. 39.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
40. 40.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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