KVL the sum of the voltage drops in a loop is equal to zero KCL The sum of the currents into a node is equal to the sum of the currents out of the node Midterm 1 Review Topics LTI Systems and Circuits Circuits Example What to watch for Series and parallel constraints Voltage source with terminal potential Resistor with known voltage drop or current Fall back on KCL and component equations Remember what to solve for LTI Systems Linear Time Invariant Systems Signal function of a single parameter such as discrete time Example n 1 if n 0 0 otherwise System transforms input signal into output signal We are dealing with single input and signal output systems Representation Difference equation y n x n py n 1 Block diagram Operator notation Y X pYR Finding poles y n p n n 0 0 otherwise p To check if a system is linear scale the input and check if the output has been scaled by the same amount To check if the system is time invariant a delay in the input causes the output to be delayed
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