Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 934 · 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.True or false: to use LED lamps wastes electricity. (a) True (b) False
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
8. 8.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
14. 14.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
17. 17.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
18. 18.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) close the fridge quickly (d) use LED lamps
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
31. 31.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
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 1 hour. How many watt-hours (Wh) are saved?
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
39. 39.🧾 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?
40. 40.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =

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