if a current of 4900A is applied to a copper wire what might happen to it? does it burn or what?
It depends on the length and area of the copper wire
Overheating depends upon the diameter, but not the length. It is the resistance per unit length that determines the temperature rise. The length will affect the voltage drop, which must also be considered.
I have not gone through the numbers, but the wire would probably have to be at least 1 inch in diameter to avoid overheating the insulation.
When a current of 4900A is applied to a copper wire, the wire may undergo certain changes depending on various factors. Copper is a good conductor of electricity and can handle high electric currents. However, if the current exceeds the wire's capacity, it can lead to several consequences:
1. Heating: The wire may heat up due to the resistance it offers to the flowing current. According to Ohm's Law (V = I * R), with a high current and a non-zero resistance, the wire can get hotter, potentially causing damage.
2. Melting: If the current is extremely excessive, it can generate a large amount of heat, causing the copper wire to melt. This is particularly true if the wire is thin or of insufficient gauge to handle the current.
3. Burnout: If the wire is unable to dissipate the heat properly, it may reach a temperature at which it burns or catches fire. This is more likely if the wire is surrounded by flammable materials or is not properly insulated.
To determine the exact outcome, you need to consider factors such as the wire's gauge (diameter), length, and the wire's resistance, which depends on its diameter and material. It is always important to ensure that the wire is capable of handling the current you are applying. If you are unsure about the wire's specifications or its current carrying capacity, consult a professional or refer to the wire manufacturer's specifications for safe operating conditions.