A total resistance of 3.00 Ω is to be produced by connecting an unknown resistance to a 12.0 Ω resistance.
It can be predicted whether the unknown resistance is connected parallel or series from the given values. Then using the formula for corresponding equivalent resistance, find the value of the unknown resistance.
Formulae are as follow:
Where, R is resistance.
Let the unknown resistance connected be R’.
From the given values, we can write that
This implies that the unknown resistance is connected in parallel.
Hence, the value of the unknown resistance is
From part a),
it can be concluded that the unknown resistance should be connected in parallel.
Hence, the unknown resistance should be connected in parallel.
Therefore, by using the formula for corresponding equivalent resistance, unknown resistance can be determined.
(a), both batteries have emf 1.20 V and the external resistance R is a variable resistor. Figure
(b) gives the electric potentials V between the terminals of each battery as functions of R: Curve 1 corresponds to battery 1, and curve 2 corresponds to battery 2.The horizontal scale is set by 0.20 Ω. What is the internal resistance of (a) Battery 1 and
(b) Battery 2?
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