Chapter 4. Voltage and Current Changes and Time Constants
Voltage and Current Changes Through Resistors
If current through a resistor changes, voltage across the resistor changes immediately. There are no time lags for voltage or for current through resistors. Therefore, the impedance that a resistor offers to the flow of current is solely a function of the size of the resistor. Frequency does not play a role. This is one of the biggest distinctions between resistors and the other two types of components.
If we plot the relationship for either voltage or current for a resistor over time, it is a straight line. For example, Figure 4-1 plots current through time for a fixed voltage applied across three different resistors. I do that here simply as ...
Get Signal Integrity Issues and Printed Circuit Board Design now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
