| ??? 06/15/04 08:00 Read: times |
#72511 - What a VDR (aka Varistor) is and does Responding to: ???'s previous message |
Hans van Pelt said:
VDR = Voltage dependent resistor.
The more Volts you apply, the more resistance it forms. No. The key feature of a VDR is that, above a certain voltage, its resistance drops. This is used to suppress voltage spikes: when a spike occurs, the VDR resistance drops and the low resistance (hopefully) reduces the spike. Obviously, the VDR has to be suitably rated to dissipate the energy in the spike without itself being destroyed! http://www.mse.eng.ohio-state.edu/~akbar/ms...z2soln.pdf |
