Question

the virus used for making electric circuit do not normally become hot why​

Answer 1

Important Things to Know First:

The Ohm's Law

It states that for a given temperature, the p.d. across a conductor is directly proportional to current.

Mathematically, V ∝ I

Or, V = IR, where R is the constant of proportionality and is called Resistance.

Resistance

Resistance of a conductor is its ability to obstruct the flow of charge.

It depends upon:

1. Length of conductor (directly proportional)
2. Area of cross section of conductor (inversely proportional)
3. Nature of Material
4. Temperature

From pt. 1 and 2,

R ∝ L/A

Or, R = ρL/A

Here rho (ρ) is the constant of proportionality and is called resistivity or specific resistance.

Resistivity

It is the resistance of a conductor at a given temperature, whose length is 1 m and area of cross section is 1 sq.m.

The Answer:

The wires used in making circuit don't become very hot because:

They are generally made of copper or aluminium, whose resistivity is low.

Low resistivity means low resistance.

If the resistance is low, electrons will move without much obstructions and hence, they'll not collide with each other and will produce less heat.