Energy Sources and Conservation Notes

Energy Sources

  • Fuel: Material that releases energy when burned.

    • Fuel + Energy \rightarrow Carbon\ dioxide + Water

    • Examples: wood, coal, petroleum.

  • Fossil Fuels: Formed from ancient organisms; non-renewable.

    • Examples: coal, oil.

Crude Oil

  • Origin: Decomposition of marine organisms over millions of years under heat and pressure.

  • Trapped in impervious rocks with natural gas layer above.

  • Refining: Separating crude oil fractions via fractional distillation in a fractioning tower based on boiling points.

    • Fractions collected from top to bottom:

      • Refinery Gas (C₁-C₄): 50°C

      • Gasoline/Petrol (C₇-C₁₂): 120°C

      • Naphtha (C₄-C₁₂)

      • Kerosine (C₁₁-C₁₆): 250°C

      • Diesel Oil

      • Lubricating Oil (>300°C)

      • Fuel Oil (350°C)

      • Bitumen (>C₂₀)

Coal

  • Formation: From plant material over millions of years (modified wood).

  • Stages: Peat → Lignite → Bituminous → Anthracite (increasing temperature and pressure).

Distillation of Coal

  • Heating coal in the absence of air produces coal gas, coal tar, and charcoal.

Charcoal

  • Production: Heating wood, peat, or bituminous coal at 500-600°C without air.

  • Composition: 85-98% carbon.

Advantages of Oil and Coal

  • Major energy source for vehicles, electricity, and heat.

Disadvantages of Oil and Coal

  • Rapid resource consumption, non-renewable, pollution (smoke, oil spills), dangerous mining.

Alternative Energy Sources

  • Hydro Power: Potential energy of falling water converted to mechanical energy (turbine) then electrical energy.

  • Solar Power: Devices include solar dryers, cookers, panels, and cells.

  • Wind Power: Wind turns turbine propellers connected to generators.

Alternative Energy: Uses, Advantages, Disadvantages

  • Solar Power

    • Uses: Domestic heating, cooking, electricity.

    • Advantages: Clean, low running cost, plentiful.

    • Disadvantages: High initial cost, difficult to store.

  • Wind Power

    • Uses: Electricity, water pumps.

    • Advantages: Clean, low recurrent expense.

    • Disadvantages: Not constant, equipment damage.

  • Hydro-power

    • Uses: Electricity.

    • Advantages: Clean.

    • Disadvantages: Not available everywhere, ecological effects.

Forests

  • Roles:

    • Regulate water flow.

    • Maintain stable temperatures (transpiration).

    • Provide products (wood, resins, fruits).

    • Recreational opportunities.

Destruction of Forests

  • Consequences:

    • Soil erosion and flash floods.

    • Irregular stream flow.

    • Reduced soil fertility.

    • Loss of biodiversity.

    • Environmental changes.

Taking Care of Forests

  • Strategies:

    • Legislation (hunting, logging, mining laws).

    • Rangers for enforcement.

    • Reforestation programs.

    • Energy farms (fuel-wood plantations).