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The dielectric strength of an insulating material, the maximum electric field that a pure material can withstand under ideal conditions without breaking down.

when the diameter is reduced to half without changing the length the resistance will become four-times so the new resistance will be 8 ohm

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 6) electrons, the third shell can hold up to 18 (2 6 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

The ?left-hand? or the most significant coloured band is the band which is nearest to a connecting lead with the colour coded bands being read from left-to-right as follows:

Digit, Digit, Multiplier = Colour, Colour x 10 colour in Ohm?s (O)

The digit for brown is 1 back is 0 and multiplier for brown is 10. tolerance is not mentioned here.

Tolerance for no colour is 20%

10% for silver
5% for gold

The SI derived unit used to measure energy or work. One joule is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of force over a distance of one meter. One joule is also equivalent to one watt-second.

Coulomb’s law:

a law stating that like charges repel and opposite charges attract, with a force proportional to the product of the charges and inversely proportional to the square of the distance between them.

The resistance-change factor per degree Celsius of temperature change is called the temperature coefficient of resistance.
A negative coefficient for a material means that its resistance decreases with an increase in temperature.
semiconductors have a negative temperature coefficient and meats have a positive temperature coefficient.

Ohms law is applicable to only linear circuits.
Semiconductor shows non-linear characteristics.
So Ohm’s Law is not applicable to semiconductors

Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points.

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