Un alambre de 1000m de longitud y resistividad 5x10−6Ωm esta conectado a un voltaje de 100v. ¿Cual debe ser el area de su seccion transversal si queremos que circule una corriente de 2A por el alambre

A = 1 cm²

Explanation:

The question is "A wire 1000m long and resistivity 5x10−6Ωm is connected to a voltage of 100v. What must be the area of ​​its cross section if we want a current of 2A to flow through the wire? "

Length of a wire, l = 1000 m

Resistivity of wire,

Voltage, V = 100 V

Current flowing in the wire, I = 2A

We need to find the area of cross section of of the wire. Resistance of a wire is given by the formula :

....(1)

A is area of cross section

Also, ....(2)

From (1) and (2) :

So, the area of cross-section of the wire is 1 cm².

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible