This is a question from my lab manual and I really don\'tunderstand what it is a

Question

This is a question from my lab manual and I really don'tunderstand what it is asking. Am I supposed to do some type ofcalculation or would I just stick some type of resistor rightbefore the device? It can't be that simple. Question: Imagine you are building a device with a 12V voltagesource. How could you use resistors to protect a sensitivecomponent that could only handle a 5 V input? Draw the section ofthe circuit with the sensitive device. This is a question from my lab manual and I really don'tunderstand what it is asking. Am I supposed to do some type ofcalculation or would I just stick some type of resistor rightbefore the device? It can't be that simple. Question: Imagine you are building a device with a 12V voltagesource. How could you use resistors to protect a sensitivecomponent that could only handle a 5 V input? Draw the section ofthe circuit with the sensitive device.

Explanation / Answer

We have a component which we know the I-V characteristic and aresistor. we connect them in series and then connect the battery acrossthem we have to choose the value of the resistor according to: 1-the voltage drop has to be 12-5 = 7 volts 2- The current flowing should be the one marked in the I-Vcharacteristic of the device. (at 5v, what is the current of thedevice?) 3- R = V/I is the value of the resistor. This resistor serves as a voltage attenuator for the device andprotects it from drawing too much current and thus dissipating toomuch power (P = VI). You also have to choose a resistor whose powerrating is more than P=7*I in order to not damage the resistor

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