Where:

Req = equivalent parallel resistance

R = ohmic value of one resistor

N = number of resistors

This equation is valid for any number of parallel resistors of equal value.

Example: Four 40 Ohm resistors are connected in parallel.

What is their

equivalent resistance?

Given:

R1 = R2 = R3 = R4

R1 = 40 Ohms

Figure 50 shows two resistors of unequal value in parallel. Since the total

current is shown, the equivalent resistance can be calculated.

FIGURE 50.

EXAMPLE OF CIRCUIT WITH UNEQUAL PARALLEL RESISTORS.