Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 90 · 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.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
4. 4.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
13. 13.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
14. 14.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave the TV on standby
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
21. 21.True or false: to use old filament bulbs saves electricity. (a) True (b) False
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
26. 26.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
27. 27.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
33. 33.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
34. 34.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
35. 35.True or false: to close the fridge quickly saves electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
37. 37.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
38. 38.🧾 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?
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?

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