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By Cross M.E., Plunkett E.V.E.

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Extra info for Physics, Pharmacology and Physiology for Anaesthetists: Key Concepts for the FRCA

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It rises as a near linear curve over the range of commonly measured values. 06 mV. 8CÀ1) and so signal amplification is often needed. mÀ3). Relative humidity The ratio of the amount of water vapour in the air compared with the amount that would be present at the same temperature if the air was fully saturated. (RH, %) or The ratio of the vapour pressure of water in the air compared with the saturated vapour pressure of water at that temperature (%). Dew point The temperature at which the relative humidity of the air exceeds 100% and water condenses out of the vapour phase to form liquid (dew).

Capacitance The ability of a capacitor to store electrical charge (farads, F). Farad A capacitor with a capacitance of one farad will store one coulomb of charge when one volt is applied to it. F ¼ C=V where F is farad (capacitance), C is coulomb (charge) and V is volt (potential difference). One farad is a large value and most capacitors will measure in micro- or picofarads Principle of capacitors Electrical current is the flow of electrons. When electrons flow onto a plate of a capacitor it becomes negatively charged and this charge tends to drive electrons off the adjacent plate through repulsive forces.

Cooling is then stopped and a mechanical stirrer induces a pulse. The curve rises quickly to achieve a plateau temperature (freezing point). 41 Resistors and resistance Electrical resistance is a broad term given to the opposition of flow of current within an electrical circuit. However, when considering components such as capacitors or inductors, or when speaking about resistance to alternating current (AC) flow, certain other terminology is used. Resistance The opposition to flow of direct current (ohms, ).

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