Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 588 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
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) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
8. 8.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
9. 9.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to close the fridge quickly saves electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
15. 15.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
16. 16.True or false: to use old filament bulbs saves electricity. (a) False (b) True
17. 17.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
20. 20.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to leave fridge door open saves electricity. (a) False (b) True
22. 22.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
23. 23.🧾 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?
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) close the fridge quickly
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
33. 33.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
34. 34.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
35. 35.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) close the fridge quickly (d) use LED lamps
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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