Question

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i need the answer in detail​

Answer 1

Answer:

minimum=12.5, maximum=170

Explanation:

minimum means parallel combination i.e,

1/R=1/20+1/50+1/100

1/R=8/100

R=12.5ohms

maximum means series combination i.e,

R=20+50+100

R=170ohms

Answer 2

Answer:

A) 12.5, 170

Explanation:

minimum resistance would be in a parallel connection, and maximum in a series connection.

resistance in parallel is calculated as:

 1/R = 1/R1 + 1/R2 + 1/R3

Here, R1 = 20 ohms

         R2= 50 ohms

         R3= 100 ohms

thus, using the formula, we get:

1/R = 1/20 + 1/50 + 1/100

so 1/R = 2/25

thus, R = 25/2

           = 12.5 ohms

So, minimum resistance is 12 ohms in a parallel connection.

resistance in series connection is calculated as:

 R= R1+R2+R3

so, R = 20+50+100

thus, R = 170 ohms

So, maximum resistance is 170 ohms in a series connection.

Hope this helps:)