Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 54 · 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 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to close the fridge quickly saves electricity. (a) True (b) False
10. 10.🧾 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?
11. 11.True or false: to use LED lamps saves electricity. (a) True (b) False
12. 12.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.True or false: to unplug idle chargers saves electricity. (a) False (b) True
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
16. 16.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
19. 19.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) use daylight to read
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
32. 32.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
34. 34.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
39. 39.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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