Resistance can be defined as the measure of degree to which a conductor opposes an electric current through the conductor. Resistance can be easily obtained for any given wire if we know its Voltage value and current value as we have the formula for voltage as “V=IR”where I is current, V= Voltage and R= Resistance. If we solve this formula to find the value of resistance, the value of “R” comes out to be “V/I” and value of I comes out to be V/R and thus it becomes easy for us to find the resistance for a particular wire but still people face problems while finding resistance of a copper wire and thus we are here to help you with that.
How to Measure the Resistance of a Copper Wire
1. Use Ohm’s law based calculator:-
If you have a numerical noted down on a piece of paper kept before you and you just feel to get the answer anyway, click any of the websites that I am mentioning here to get its solution within a span of seconds. All you have to do is to put down the numeric values from your question in the provided fields and the answer will get displayed before you on screen with just a single click. Ohmslaw Calculator or Ohm Calculator
2. The other such formulas:-
The formula that I told you in the beginning was of Ohm’s law. Now we know that value of power is P=VI and as we know that I=V/R, the equation for P becomes RxIxI or RxI2 which is equal to V2/R and this gives us another relation i.e. R=P / I2 = V2 / P
3. Relation Between Resistivity and Resistance:-
Talking about the relation between resistance of a wire and its resistivity, the resistivity of a wire is equal to is resistance multiplied by area of cross section overall divided by the Length or in other words you can say that resistance of a wire is equal to the resistivity multiplied by length overall divided by the area of cross section. I.e. R = p (L/A) where p = resistivity of copper, L = length, A = area. Some numerical won’t give you the direct value of current, Voltage or Resistance and in such cases, the resistivity might be given in the question.
4. Study the Series and Parallel Combinations:-
There is a chapter based on electricity, ohm’s law, series and parallel combinations etc. in NCERT science textbook of 10th class. I think that this chapter has got enough matter inside it to solve your catharsis of resistance. You can download one such pdf book from Google and study this chapter thoroughly to clear the rest of your doubts and obviously to have some more numerical for you to solve on the same topic.
5. A Live Example of Finding Resistance of Copper Wire:-
Let me make you understand this with the help of a live example. Suppose you have been provided with a wire with unknown resistance and you are provided with the value of its diameter as well as length and resistivity, you can easily find its resistance by applying the relation R = p (L/A) putting the respective values and solving the right hand side equation to get result at left hand side.