# Kirchoff's laws help

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#1
I don't understand this example. Why is the total resistance 35 ohms when it should be 25 ohms
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#2
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4 days ago
#3
Okay mate.

First we need to calculate the total resistance across parallel combination lad:

1/15 + 1/20 + 1/12 = 1/5
This means the resistance of parallel combination is 5 ohms.
5 + 10 = 15ohms, so between x and y the resistance is 15.

Is that the question you need help on or is it something else?
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#4
(Original post by RaA64)
Okay mate.

First we need to calculate the total resistance across parallel combination lad:

1/15 + 1/20 + 1/12 = 1/5
This means the resistance of parallel combination is 5 ohms.
5 + 10 = 15ohms, so between x and y the resistance is 15.

Is that the question you need help on or is it something else?
No but thanks for helping. In the first screenshot it says that the total resistance is 20+15=35 ohms but I think it's wrong am I right? Use the second screenshot to help you.
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4 days ago
#5
Bro, you just got a bit confused.

In the first screenshot, read all the question - it says if Ra is 20 ohms, the total resistance is 35 ohms.

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#6
(Original post by RaA64)
Bro, you just got a bit confused.

In the first screenshot, read all the question - it says if Ra is 20 ohms, the total resistance is 35 ohms.

Oh! Thank you that really did confuse me!
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