Question

three resistance of 4ohm ,5ohm and 20ohm are connected in parallel waht is their combined resistance

Answer 1

Resistance $(R_1)$ = 4 ohms

Resistance $(R_2)$ = 5 ohms

Resistance $(R_3)$ = 20 ohms

All the resistors are applied in parallel. Hence, we will use the parallel formula to find the equivalent resistance.

$\frac{1}{R_e_q}= \frac{1}{R_1} + \frac{1}{R_2} +\frac{1}{R_3}$

$\frac{1}{R_e_q}= \frac{1}{4} + \frac{1}{5} +\frac{1}{20}$

$R_e_q = \frac{20}{4 + 5 + 1}$

$R_e_q = \frac{20}{10}$

$R_e_q = 2$ ohms

Hence, the equivalent resistance is 2 ohms

Answer 2

Answer:

2 ohms

Explanation:

GIVEN RESISTANCE :

R1 = 4 ohms

R2 = 5 ohms

R3 = 20 ohms

As given that they are connected in parallel,

so, 1/Rp = 1/R1 + 1/R2 + 1/R3

             = 1/4 + 1/5 + 1/20

             =5 + 4 + 1/20

             = 10/20 = 1/2

        Rp = 2 ohms