Question

you are given an iron wire of length 10 cm how do you find its resistance using a 12 volt battery voltmeter ammeter and plug key? without Breaking the wire how do you decrease its resistance? ​

Answer 1

Answer:

We will find the resistance of wire by measuring the current and voltage across the wire and then we can use ohm's law to find the value of resistance

in order to decrease the resistance we will fold the two ends of wire so that its length is decreased and area will increase

Explanation:

We will connect the two ends of the wire across the battery and connect the ammeter and plug in series with it.

Now we will connect the voltmeter across the wire.

Now as we close the plug the current flows into the wire which we will measure with the help of ammeter

Now the voltage difference across the wire is measured with the help of voltmeter.

now we can use ohm's law for wire

$V = i R$

so resistance of wire is

$R = \frac{V}{i}$

As we know that resistance is given as

$R = \rho \frac{L}{A}$

now in order to decrease the resistance we will fold the two ends of wire so that its length is decreased and area will increase

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Topic : Ohm's law

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