Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 836 · 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 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) unplug idle chargers (d) close the fridge quickly
3. 3.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.True or false: to use daylight to read wastes electricity. (a) True (b) False
9. 9.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
11. 11.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
12. 12.True or false: to unplug idle chargers saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
15. 15.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
16. 16.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
19. 19.🧾 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?
20. 20.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
22. 22.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
24. 24.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
27. 27.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
33. 33.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
35. 35.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity

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