Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 572 · 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 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
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 8 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
13. 13.True or false: to leave the TV on standby saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) unplug idle chargers
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🧾 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?
26. 26.True or false: to leave fridge door open saves electricity. (a) True (b) False
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use old filament bulbs saves electricity. (a) True (b) False
30. 30.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to use daylight to read wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
34. 34.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms
37. 37.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
40. 40.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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