1. Scientific Notation  The form of a number in scientific notation: N X 10 x {Unit}  N: Numbers  10: Base  x: Exponent  Never forget to write the UNIT ……if it exists

2. Metric prefixes SymbolNameMultiplication ppico1 x 10 -12 nnano1 x 10 -9 μmicro1 x 10 -6 mmille1 x 10 -3 kkilo1 x 10 3 MMega1 x 10 6 GGiga1 x 10 9 TTera1 x 10 12

3. AVERAGE  Definition  Most typical value or most expected value in a collection of numerical data  Different kinds of average  Mean: the sum of all values divided by the number (n) of different values:  Median: The middle value in the data set  Mode: The most frequently occurring value in the data set

4. Integrated Average  The area under the curve of a time dependent function divided by the segment of the range over which the average is taken  This average is applied often in RC circuits  The output of the circuit ~ time average of the input signal 0 V tt1t2 T V1 Volts Time

5. Root-mean-square “rms”  Used in electrical circuits and certain technologies EX: Comparing of AC sine wave current with DC current level that will produce the same amount of heating in an electrical resistance.  Definition of rms: V rms : is the rms value T: is the time interval t1 to t2 V(t): is the time-varying voltage function  Special case: the rms for sine wave value of voltage is V p /√2 or 0.707 V p (V p is the peak voltage)