Question

What happens to a circuit's resistance (R), voltage (V), and current (I) when when you decrease the diameter of the wire in the circuit?



A.
R decreases.
V is constant.
I increases.


B.
R decreases.
V decreases.
I increases.




C. R increases.
V increases.
I decreases.

D. R increases.
V is constant.
I decreases.

Answer 1

Explanation:

the answer is option D because I is inversely proportional to R then if we will decrese the daimeter then R increase but I decrease .

but v doesn't depend on R.

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Answer 2

When you decrease the diameter of the wire in the circuit, D. R increases, V is constant and I decreases.

Explanation:

• Resistance of a material is referred to the tendency of a material to oppose flow of current. According to Ohm's Law: "Potential difference applied across a conductor is directly proportional to the current flowing through it".

• Ohm's Law: $V=IR$

• Expression for resistance can also be written as:

$R=$ρ$\frac{L}{A}$

Where $R$ is the resistance of material, ρ is the resistivity of material, $A$ is the cross-sectional area and $L$ is the length of conductor.

• If $A$ decreases then $R$ increases and $I$ decreases and $V$ is constant.