Simulations in general allow us to take any physical real time system or device and model it using mathematical models, in order to study its behavior changing any of the characteristics that may influence the way it behaves.
But why do we want to change the characteristics, why do we want to study its behavior, why do we want to simulate?
We study the behaviour due to many reasons, one of them is to be able to know how does our device behave under certain circumstances, so if we place a diode at a certain temperature, how will it behave? What if the temperature increases, will electrons move faster in a circuit leading to faster results in a shorter time? Or will it have no effect at all? What if I connect a resistor in series with a capacitor, how will the voltage output on the resistor will change with time? What if I take the voltage output on the capacitor itself, can this response be used in any nowadays device? All these questions may be answered by engineers and not technicians* only through simulations when they will be able to change different circuital parameters without needing to implement this practically.
Another reason is efficiency. How efficient simulations would be? I would consider them 99% efficient, since 1% lies to the time one spends doing the simulations, although I would give it a 100%, so if someone wants to build a circuit in real life and test its transient response, I bet he would not get it right unless after repeating it several times. So using electrical simulations, you can design your own circuit, test its response with time, and if it worked as per your need for a project or whatever, you can go ahead and implement it practically. So you wont spend time and money fixing several circuits with several components and burning several components due to unexpected high current or whatever.
*Next time we will talk about the difference between an engineer and a technician and how it is related to our topic.
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