Post History
In circuit analysis why always the power has upper hand over energy? One obvious reason: - If we calculate how much power a resistor dissipates we can calculate how hot it will get (knowing i...
Answer
#2: Post edited
by
Andy aka
·
2021-03-21T10:28:19Z (about 3 years ago)
- > _In circuit analysis why always the power has upper hand over energy?_
- One obvious reason: -
- If we calculate how much power a resistor dissipates we can calculate how hot it will get (knowing it's thermal resistance and ambient temperature and some other factors). We need to know how hot stuff gets because we need to ensure things don't get too hot and burn out.
Energy doesn't really help in this situation unless we know the timeframe in which the energy was used but, then we are talking about power.
- > _In circuit analysis why always the power has upper hand over energy?_
- One obvious reason: -
- If we calculate how much power a resistor dissipates we can calculate how hot it will get (knowing it's thermal resistance and ambient temperature and some other factors). We need to know how hot stuff gets because we need to ensure things don't get too hot and burn out.
- Energy doesn't really help in this situation unless we know the timeframe in which the energy was used but, then we are talking about power.
- However, there are many cases where we are more interested in energy (such as reactive components) so, there is no "upper hand"; just examples that require energy to be assessed and, examples that need power to be assessed.
#1: Initial revision
by
Andy aka
·
2021-03-21T10:26:43Z (about 3 years ago)
> _In circuit analysis why always the power has upper hand over energy?_ One obvious reason: - If we calculate how much power a resistor dissipates we can calculate how hot it will get (knowing it's thermal resistance and ambient temperature and some other factors). We need to know how hot stuff gets because we need to ensure things don't get too hot and burn out. Energy doesn't really help in this situation unless we know the timeframe in which the energy was used but, then we are talking about power.