Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 955 · 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 family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
6. 6.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
16. 16.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
23. 23.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
28. 28.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
30. 30.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
32. 32.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
34. 34.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.True or false: to close the fridge quickly saves electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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