. Electronic apparatus for biological research . Figure Notice that a delta is formed by the 3,2 and 5 ohms resistances, and another by the 4, 2 and 6 ohms resistances. Choose one, say the first, and convert to the equivalent star {Figure ). Rb = 5 + 2 + 3 5x2 5 + 2 + 3 _ 2X3 '' ~ 5 + 2 + 3 = 1-5 a = in = o-6n The remainder of the problem is quickly solved by the rules for series and parallel resistances. ThevenirCs theorem This theorem is for finding the current in any member of a network of resistances being supplied from a generator. It may be stated as follows: If the resistance i

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. Electronic apparatus for biological research . Figure Notice that a delta is formed by the 3,2 and 5 ohms resistances, and another by the 4, 2 and 6 ohms resistances. Choose one, say the first, and convert to the equivalent star {Figure ). Rb = 5 + 2 + 3 5x2 5 + 2 + 3 _ 2X3 '' ~ 5 + 2 + 3 = 1-5 a = in = o-6n The remainder of the problem is quickly solved by the rules for series and parallel resistances. ThevenirCs theorem This theorem is for finding the current in any member of a network of resistances being supplied from a generator. It may be stated as follows: If the resistance in question, R, be imagined to be removed, the remainder of the network may be represented by a constant voltage generator of E' in series with a resistance r', where E' is the open-circuit voltage appearing across the terminals initially joined by R, and r' is the effective resistance 'looking into' these terminals. Thus, an equivalent circuit for the network with R in place is just {Figure ) and the current through R is E'l{R + r'). 12

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