(Hons) © 2007− 2020 Eric Coates MA BSc. What is the equivalent resistance? This is of great use in fault finding. Notice however that this formula does NOT give you the total resistance RTOT. What is the equivalent resistance?Two resistors connected in parallel have values of 10 kΩ and 30 kΩ. - Parallel circuit with two unequal resistors.Given:Solution:Four equal resistors are connected in parallel, each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?Three resistors connected in parallel have values of 12 kΩ, 20 kΩ, and 30 kΩ. The terms total resistance and equivalent resistance are used interchangeably. In either case (for resistors) the total resistance of that part of the circuit containing the resistors can be calculated using the methods described below. We can break the process up into 3 steps so we can make sense of the process. Contact Us. Not really, its just a matter of repetition, and in practice you don´t often come across many parallel networks with much more than two resistors. Three 12K resistors in parallel have a combined resistance of. FIG 1 . (Use the reciprocal method. What is the equivalent resistance of a 20-ohm and a 30-ohm resistor connected in parallel, as in figure 3-47?Figure 3-47. Privacy Statement - There are several methods used to determine the equivalent resistance of parallel circuits. You can use the "product over sum" formula: For circuits with more than two parallel resistors, simply work out two parallel resistors at a time using the product over sum formula, and then re-draw the circuit replacing the two resistors with a single resistor whose value is the combined resistance of the two.