TDI-Dynaload Division
WCL488 Series Water Cooled Electronic Loads
Operation & Programming Manual
402828, Rev. B1
Page 99
Normally Open When the contacts of a switch or relay are normally open or not connected.
When activated the contacts close or are connected.
NPN
Transistor using n-type p-type n-type semiconductor material.
O
Ohm
Unit of resistance (represented by the Greek capital letter omega “
Ω
” and
the symbol “ R” ).
Ohm’s Law
I=V/R where I is the current flowing, V is the voltage and R is the
resistance.
Open Circuit
Circuit having an incomplete path for current flow.
Oscilloscope
Electronic instrument that produces an instantaneous trace on the screen of
a cathode ray tube corresponding to oscillations of voltage and current.
Output
Part of a circuit where the processed signal is available.
Output
Impedance
Impedance measured at the output terminals of a device, without a load
connected.
Output Power
Amount of power that a component, circuit or system can deliver to a load.
Overload
Condition that occurs when the load is greater than a system can handle.
Overload
Protection
Protective device such as a circuit breaker that automatically disconnects a
load when current exceeds a predetermined value.
