Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 260 · 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.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
2. 2.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
13. 13.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
16. 16.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
19. 19.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
27. 27.True or false: to leave the TV on standby saves electricity. (a) True (b) False
28. 28.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
30. 30.True or false: to leave fridge door open saves electricity. (a) True (b) False
31. 31.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 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?
34. 34.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
36. 36.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
38. 38.🧾 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?
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly

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