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What is the value of unknown resistor R in Fig. if the voltage drop across the500 Ί resistor is 2.5 V? All resistances are in ohms.A5505012 V500 |
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Answer» drop on 50 ohm resistance=2.5*50/500=0.25 vdrop across cd=2.5+0.25=2.75vdrop across 550 ohm=12v-2.75v=9.25 vi=9.25/550=0.0168 Ai2=2.5/500=0.005Ai1=0.0168-0.005=0.0118AR=2.75/0.0118=233 ohm |
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