Elementary Electrical Calculations a book Suitable for the Use of the First And
Elementary Electrical Calculations a book Suitable for the Use of the First And
William Henry Nichols James
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38. Two cells, A and B, each of 1 volt E. M. F. And of 5 and 10 ohms resistance respectively, have the positive pole of A joined to the negative pole of B, and the negative pole of A joined to the positive pole of B. What is the P. D. Between the respective junctions ? 39. Two resistances of 6 and 8 ohms respectively are connected in parallel, and the combination placed in series with a resistance of 4 ohms. What voltage must be applied in order that a current of 4 amps, may flow ? 40. What res...istance must be inserted in series with two other resistances of 120 and 180 ohms respectively, the latter being connected in parallel, in order that when 110 volts are applied a current of 1*2 amps, will flow ? CHAPTEE V POWER AND WORK WHEN any force overcomes the resistance opposed to it and moves its point of application, work is per- formed. Thus, if the pressure of the steam behind the piston of a steam-engine overcomes the resistance opposed to it and moves the piston along the cylinder, work is done by the steam ; if, however, the resistance opposed to the force of the steam is sufficient to prevent the piston moving, then no work will be performed.
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