Question

The output current of a 60 percent modulated AM generator is 1.5 A. To what value will this current rise if the generator is modulated additionally by another audio wave whose modulation index is 0.7? What will be the percentage power saving if the carrier and one of the sidebands are now suppressed?

Answer 1

We know that

I_c = \(\cfrac{I}{\sqrt{1+\frac{m_1^2}2}}\) 

I_c = \(\cfrac{1.5}{\sqrt{1+\frac{(0.6)^2}2}}\) 

I_c = \(\frac{1.5}{\sqrt{1+0.18}}\)

I_c = \(\frac{1.5}{\sqrt{1.18}}\) 

I_net = I_c\(\sqrt{1+\frac{m_1^2}2+\frac{m_2^2}2}\) 

I_net = \(\frac{1.5}{\sqrt{1.18}}\)\(\sqrt{1+0.18+0.245}\)

I_net = \(\frac{1.5}{1.086}\)\(\sqrt{1.425}\) 

I_net = 1.38 x 1.19

I_net = 1.64 A