Equivalent resistance!
Electricity and Magnetism
Level
2
The equivalent resistance between the points A and B is :
15
12.5
8
40
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1 solution
Let's ignore for a while points C and D. We then get a circuit with two paths, one that goes through one 15ohm resistance and another that goes through 2. These two paths are in parallel, so the Eq. resistance is ( 1 5 1 + 3 0 1 ) − 1 = 1 0
Therefore, the circuit must at max have 10 ohms of resistance, since we didn't count extra paths that would reduce the total resistance.