. Electronic apparatus for biological research . Sprayed metal electrode Selenium compound layer Figure Cross-section through a selenium barrier-layer photocell A convenient equivalent circuit is shown in Figure A current generator /,, is shunted by a capacitor C and an internal resistance /?, in series with a resistance R^. If the external load resistance is R, the current through it becomes: R, + Rs + R Rg is mainly the value of the thin collecting electrode and is about 50 ohms in most cells. C varies from 0-1 to 0-5 /uF; depending upon the cell

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