. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Medical induction coil. Diagram of connections. The Secondary Current.—^The varying magnetic flux due to the inter-rupted current in the primary coil induces an alternating E. M. the secondary. Its direction is that of the primary current whilethe flux is decreasing, and the opposite while it is increasing (p. 75).This secondary E. M. F. is much higher than the primary, because thesame variation in magnetic flux takes place through a much larger Fig. 67. Secondary induced E. M. F. number of tu
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Medical induction coil. Diagram of connections. The Secondary Current.—^The varying magnetic flux due to the inter-rupted current in the primary coil induces an alternating E. M. the secondary. Its direction is that of the primary current whilethe flux is decreasing, and the opposite while it is increasing (p. 75).This secondary E. M. F. is much higher than the primary, because thesame variation in magnetic flux takes place through a much larger Fig. 67. Secondary induced E. M. F. number of turns. Moreover, since the self-induction of the primarycoil causes the current in that coil to rise comparatively slowly, whilethe break is much more sudden, as seen in Fig. 64, the positive E. M. the secondary coil is much greater than the negative. Fig. 67exhibits the character of the secondary E. M. F., the negative portionof the curve corresponding to the closing of the primary current andthe positive part to the break. 92 APPLICATIONS OF ELECTROMAGNETIC INDUCTION When the terminals of the secondary coil are joined through a con-ductor of high resistance, such as the human body, a current is producedof the same general character as the E. ^I. F. This current is, however,lessened by the self-induction of the secondary coil itself, which actsso as always to oppose the variations of the current. Thus, while theE. M. F. between the terminals of the secondary may be three orfour hundred volts on open circuit, the effective value between thesam
Size: 2809px × 890px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidelectricityitsme00pott
