. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. tigiire Figure First, remove the 2 ohms resistance {Figure ). We now have two potential dividers and the bridge can be solved by the rules for series resis- tances: The resistance in the path A-C-B is 7 ohms; therefore the current in the path A-C-B is 10/7 amps; therefore the potential difference A-C is 3 X (10/7) volts. By a similar process the A-D is 5 X (10/11) volts. So the C-D is {5 X (10/11)} — {3 X (10/7)} and this is our E'. To find /•', bearing in mind 3Q l
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. tigiire Figure First, remove the 2 ohms resistance {Figure ). We now have two potential dividers and the bridge can be solved by the rules for series resis- tances: The resistance in the path A-C-B is 7 ohms; therefore the current in the path A-C-B is 10/7 amps; therefore the potential difference A-C is 3 X (10/7) volts. By a similar process the A-D is 5 X (10/11) volts. So the C-D is {5 X (10/11)} — {3 X (10/7)} and this is our E'. To find /•', bearing in mind 3Q l-^/^A/v^ sn B r' -VWVVV^ '0I« (f'l)n JIO 11 )-(3 JIO 7 volts /?>2Q 6Q Figure Figure that the generator has no internal resistance, we re-draw the bridge as in Figure 'Looking in' at C-D, we see a resistance of 3 ohms in parallel with 4 ohms, plus 5 ohms in parallel with 6 ohms. 3X4 , 5x6 r = 12 30 7 "^ 11 3+4'5+6 The equivalent circuit is therefore Figure and the current through R may be quickly found. G L G V^AA^^^ L G ^^ L Figure Figure Figure Potentiometer control of power In Figure we have a generator G feeding some kind of load L. We often wish to control the amount of power being supplied to L. If G is of the constant-voltage type, such as the electric supply mains, and L is, say, a lamp, an appropriate method would be a variable series resistance {Figure ) or 'rheostat' to 'drop' some of the voltage. Similarly, if G is of the 13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
Size: 1979px × 1263px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
