Rationalize each numerator. See Example 7. 2 - 2116

Voltage drop across a resistor is always positive. Power is always dissipated by a resistor. For loop problems, if the direction of current is given, draw the loops in that direction. Current flows from higher to lower voltage When current flows from + to – then power of the source is + (Power is said to be dissipated) When current flows from – to + then power of the source is – (Power is said to be supplied) A complete circuit is required for current flow. No breaks. Diodes and transistors are some examples of components that don’t follow Ohm’s law. Voltage across elements in parallel are equal Current across elements in series is equal For op amp problems, check for negative feedback. Establish V = V+ then do a node equation either at v o