Equivalent Resistors

November 29, 2019

To quickly calculate the equivalent resistance value of two resistors in parallel you can use the parallel resistor calculator. So their equivalent resistance let us denote it by r s is.

Resistors In Series

The Resistor Cube Equivalent Resistance Conundrum Rf Cafe

Figure 2 Equivalent Circuit Of Figure 1 If Re R1 R2 R3

As a test if we enter resistances of 4 6 and 12 ohms the answer should be 2 ohms.

Equivalent resistors. Resistors in parallel on the other hand result in an equivalent resistance that is always lower than every individual resistor. Consider finding the equivalent resistance of the network shown below. Resistors in series are equivalent to one resistor whose resistance is the sum of each individual resistor.

If there are n resistors in a series network then. Therefore the above circuit is same as the following. So their equivalent resistance let us denote.

We see the resistors r 1 and r 2 are connected in series. Next we see the resistors r 3 and r 4 are connected in parallel. Here the reciprocal 1r value of the individual resistances are all added together instead of the resistances themselves with the inverse of the algebraic sum giving the equivalent resistance as shown.

Example a circuit designer needs to install a resistor with 9 ohms and can choose from the e 12 series of preferred values 10 12 15 18 22 27 33 39 47 56 68 82. The combination of three 3 w resistors in series is equivalent to having a single 9 w resistor. It has been established that the voltage across each resistor in a parallel combination is same and the total current is equal to sum of individual currents.

This calculator determines the resistance of up to 10 resistors in parallel. Enter resistances into the boxes below and when all values have been input click on the calculate button and the result will appear in the box below that button. This single resistance is called equivalent resistance of the circuit and is used to replace any number resistors in series.

R s r 1 r 2 100 w 300 w 400 w. Any number of resistors connected in a parallel combination can be replaced by a single resistor with the resistance equal to the equivalent resistance of the parallel combination resistors. For resistors in parallel the equivalent circuit resistance rt is calculated differently.