SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A series circuit contains three resistors, 5, 2, and 2. What is the total resistance?
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2 ohms
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5 ohms
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7 ohms
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9 ohms
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Explanation:
Detailed explanation-1: -It is not possible to have a 12 ohm resistance with three 9 ohm resistances in any combination. 1. If we connect 2 resistances of 9 ohms in parallel, their combination will give 9/2 = 4.5 ohm. When another resistance of 9 ohm is connected in series with 4.5 ohm, we get 13.5 ohms.
Detailed explanation-2: -To get an equivalent resistance of 9 , atleast one six ohm resistor should be connected in series with the other resistors. Connecting the remaining two resistors in parallel will yield an equivalent resistance of 3 . Hence, the first figure shows the configuration of resistors to get equivalent resistor of 9 .
There is 1 question to complete.