Re: Resistive vs. Capacitve Loads
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Sat, 10 Feb 2007 18:41:18 -0500
max w. wrote:
I see these terms often, but I haven't seen a description between theA resistive load passes current in proportion to the instantaneous voltage. If there is voltage across the load, it is passing current, regardless of time.
two that I
am comfortable with. Or better yet an example an example of each.
Any help would be appreciated,
max w.
A capacitive load pases current when the voltage across it changes, and in proportion to how fast it is changing. Any steady voltage drives no current through a capacitive load.
So resistive loads draw current throughout the time when the source applies voltage to it. The capacitive load draws a spike of current when the source tries to step the voltage, and slows the rise time of the step, if the source has series resistance.
If the load is a resistance and capacitance in parallel, then the source must supply both currents simultaneously.
If the load is a series combination of resistance and capacitance, the capacitor blocks any DC current, and the resistor limits the current that can be passed during any fast rate of rise or fall, but extending the time the current passes, after the step in voltage has stopped changing. There will be and exponential decay of current as the resistor drop shrinks, and the capacitor sees the fill applied voltage gradually, instead of as the source changes it.
.
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- Resistive vs. Capacitve Loads
- From: max w.
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