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Table 7-1.  DC Relationships
TM 9-254 CHAPTER 7 ELECTRONIC DATA Section I.  BASIC LAWS AND FORMULAS 7-1. General. This section defines the basic laws and formulas used in electronic theory.  For clarity the section has been divided into two parts, one addressing direct current (DC) and the other addressing alternating current (AC). 7-2. Direct Current. a. General.  Direct current or DC is the flow of electrons from a point of low potential to a point of high potential. Typical sources of DC would be a flashlight or automobile battery. b. Ohm’s  Law  for  DC  Current.    Developed  by  George  Simon  Ohm  in  1827,  this  law  states  that  the  current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.  Figure 7-1 shows the three forms of this law as related to the simple DC circuit provided. I = R E E = IR R = I E Where: I   is the current in amperes E  is the voltage in volt R   is the resistance in ohms. Figure 7-1.  Ohm’s Law for DC Circuits c. DC  Power.    Power  is  a  measure  of  the  energy  expended  in  a  circuit  when  the  current  flows  through  a resistance.  Power is measured in watts and can be determined by the following formulas: P = IE P = I2R P = R E2 Where: P  is the power in watts. E  is the voltage in volts. I   is the current in amperes. R   is the resistance in ohms. 7-1

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