(1) I have five circuits and want to run each one, one at a time, and then all five at the same time. My source is 12Vdc and 1500mA. The first circuit is 1.992 Mega ohms, the second is 3248 ohms, the third is 13.2k ohms, and the fourth is 0.247 Mega ohms and the fifth is .777k ohms. Now, the first four circuits use 5V and the fifth uses 9V.

First, how do calculate or get a resistor with this information to both limit the current for each circuit and make sure I get the right voltage for each circuit and then run each one at a time and then all at once.

(2) Next, if I have 12Vdc and 1500mA going into a resistor then to and led then to ground, how do I figure the resistor that will protect the lead?

You need to connect a resistance, say R Ohms, in series with the source and then feed the load (circuit, as you called it) which is characterised by a Voltage Vl and resistance Rl.

Now, you CANNOT have a single value of R which will give you the right voltage to each circuit. R depends on both Vl and Rl. For each combination of (Vl,Rl), you need a separate R and then a separate R to run all the first four(You cannot run all the five all at once since the fifth circuit needs 9 Volts while the first ...

Solution Summary

The solution involves an explanation of resistors and calculations of the voltage of each circuit (in a series of five circuits) when run individually, and as a group. In addition, an explanation of how a resistor protects a lead is given, as well as the method for measuring current in a circuit.

... comprises detailed step-by-step explanations and examples ... If the resistors are matched, as given in ... Although this resistor matching approach simplifies the ...

... solution includes diagrams, formulas and good explanations used in ... equivalent resistance of the combination of resistors and the current in each resistor. ...

... confused here, if know the resistor must satisfy a ... solution is comprised of detailed explanations of calculation... line manufactures 1000 Ω resistors that must ...

... instructor gave you a different formula for finding ... with annotations accompanied with clear explanations to determine the current in each resistor. ...

... P= V2/R For the given circuit, when the variable resistor is set at ... This solution is comprised of detailed explanation and step-by-step calculation of the ...

... in the resistance with step-by-step workings and explanations. ... The resistance of a resistor is measured 10 times ...Calculate the uncertainty in the resistance. ...

... a circuit diagram and explanations and calculations to determine ... All formulas and brief explanations are included. ... diode as a simple equivalent resistor, rD=vD ...

... best answer to your problem after understanding explanation from this ... In this circuit there are resistors in series and parallel ... [Recall that if resistor R1 & ...

... Please see the attached file for solutions and explanations. ... we have already found the differential equation with respect to the voltage of the resistor in the ...

... a detailed and step-by-step explanation for the ... is always smaller than that of either resistor. For resistors connected in parallel, the equivalent resistance ...