CHAPTER VII. POWER AND ENERGY OF THE COMPLEX CIRCUIT. 513 

50. Instantaneous power. Effective or mean power. Power 

transferred. 513 

51. Instantaneous and effective value of energy stored in the 

magnetic field ; its motion along the circuit, and varia- 
tion with distance and with time. 513 

52. The energy stored in the electrostatic field and its compo- 

nents. Transfer of energy between electrostatic and 
electromagnetic field. 517 

53. Energy stored in a circuit section by the total electric 

field, and power supplied to the circuit by it. 518 

54. Power dissipated in the resistance and the conductance of 

a circuit section. 519 

55. Relations between power supplied by the electric field 

of a circuit section, power dissipated in it, and power 

transferred to, or received by other sections. 520 

56. Flow of energy, and resultant circuit decrement. 521 

57. Numerical examples. 522