KCL and KVL, frequency of 3v DC battery?, i. why Silver is the best conductor than copper?

Question

Please answer following three questions

i. Silver is the best conductor than copper, then why Copper wires are generally used in daily life instead of silver wires?
ii. What will be the frequency of 3v DC battery?
iii. In which circuit analysis techniques KCL and KVL are used.

Answer 1

i. Copper is cheaper and stronger than silver while having very good conductive properties and relatively resistant to corrosion.

ii. The frequency of a DC battery is zero.

iii. Kirchhoff's Voltage Law - KVL - is one of two fundamental laws in electrical engineering, the other being Kirchhoff's Current Law (KCL).

KVL is a fundamental law, as fundamental as Conservation of Energy in mechanics, for example, because KVL is really conservation of electrical energy.
KVL and KCL are the starting point for analysis of any circuit.
KCL and KVL always hold and are usually the most useful piece of information you will have about a circuit after the circuit itself.

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Answer 2

Silver is too soft and too expensive. Copper has conductivity close to silver and is reasonably strong yet easy to work with. Aluminium is another choice as an electrical conductor.

DC battery will not have any frequency. Frequency is associated with AC (Alternating Current). DC means Direct Current. Frequency is Zero.