Question

Your friend needs 10 Ohm resistance. He came to you and asked, but

you have 40 ohm resistors.

i. How many resistors your friend will ask you?
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Answer 1

Answer:

here is your answer mate hope it helps you

Answer 2

Given : 10 Ohm resistance required

Resistor available of  40 ohm

To Find :How many resistors required

Solution:

Resistance in series  gets added R = R1 + R2

Resistance in parallel  1/R = 1/R1 + 1/R2

Let say N resistance of 40 Ω are taken

Then  1/R  = 1/40 + 1/40  + 1/40 +.............+ N times

=> 1/R = N ( 1/40)

=> R = 40/N

R = 10  Ω

40/N = 10

=> N = 40/10

=> N = 4

4 resistors of 40 ohm are required to get  10 Ohm  ( when connected in parallel)

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