The antenna current of an AM transmitter is 8 A when only the carrier wave is sent but it increases to 9.19 A when carrier is modulated. Find the  modulation.

Total power carried by AM wave  PT=Pc1+m22 If R is load resistance                      Im→is current when carrier is modulated                    IC→is current when demodulated, then PtPc=Im2RIC2R    ⇒  1+m22=Im2RIc2R Given : Im=9.19 A ,           IC=8 A ∴m2=29.198.02−1     ∴m=0.8