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Tap water differs from pure water, it contains more chemical contents arise in drinking water, it effect on health concern only after extended exposure of years, rather than months. The purpose of this article is to study the optical properties of tap water by using different power density from HeNe laser beam transport through some samples. These samples of water mostly contain NaCl salts and clay .When we increasing concentration and sample length we can observed that decreasing transmittance ,(absorption and extinction) coefficients while the absorbance will be increased .At the 5 cm sample length we observed that tap water has transmittance about 17%, while NaCl (0.7) concentration has 58%,clay solute has 2%, and mixing from (0.7 NaCl and 0.15 clay) concentrations has transmittance 8%, The absorbance and absorption coefficient of tap water is greater than NaCl and less than clay alone and mixing (clay with salt) at the same sample length.

This search discusses the simulated and design of the battery model. The simulated is carried out using Personal Simulation Program for Integrated Circuits Emphasis PSPICE software for the complete model in order to get the results for the proposed battery model. The PSPICE lead acid battery model is consists of the charge efficiency and Battery voltage components. Details are also given to the method of measuring the charge efficiency then the battery model will be tested as input source to the bidirectional Buck-Boost converter to verify its validity.Keyword: Lead Acid Battery, PSPICE, Bidirectional converter, charge efficiency. IntroductionBattery, charge efficiency (C.E), State of Charge (SOC) and internal resistance (Rbat) are affected on the battery performance. Temperature also affects the life of the battery. Therefore, ideally, batteries should operate within a temperature range, SOC and charge efficiency that is optimum for performance and life.The state of charge of a battery is useful in determining the available capacity of the battery. It is expressed as the percentage of the rated capacity of the battery. State of charge tells the user how much more energy the battery can deliver to the application before it needs recharging. Based on the physical parameter t hat is measured, SOC determination methods are classified into the following types: [1]1. Direct Measurement 2. Voltage-Based SOC Estimation 3. Current-Based SOC Estimation 4. Specific Gravity Method In this work the current based S OC estimation is used to modulate the battery.Charge efficiency refers to how many amp-hours are absorbed by the battery compared to how many charge amp-hours are delivered. A charge efficiency factor of 94% means that for each 100 amp-hours of charge delivered, the battery increases charge by 94 amp-hours. Charge efficiency is typically very high when the battery is highly discharged and somewhat lower when the battery is near full charge. The factory default setting of 94% is a