Question

find the resistance of new wire if pre exesting wire represent 120 ohm resistance (when we fald it)
iska solution comment mein send karo yeh class 10th ka Question hai​

Answer 1

Answer:

As current passes through the wire it quickly heats up and glows red hot. But the electrical resistance between two points can depend on many factors such as the conductors length, its cross-sectional area, the temperature, as well as the actual material from which it is made.

CALCULATION OF CABLE RESISTANCE

• Hence R = 22.5/10 = 2.25 Ohms per km.
• Length of conductor = 500m =500/1000 = 0.5km.

• Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium, The resistance per km for Aluminium is given by:

• R = 36/S(c.s.a)
• Again S = 10mmsq.
• Hence R = 36/10 = 3.6 Ohms per km.

• Length of conductor = 0.5km.