একটি ট্রান্সফরমার (Transformer) 400Hz ফ্রিকোয়েন্সিতে চলছে। ন্সৈফরমারটির ফ্লাক্সের সর্বোচ্চ (maximum flux) মান এবং সেকেন্ডারিতে ইনডিউজড ভোপ্টেন্ড (induced voltage in secondary) নির্ণয় করুন। যদি প্রাইমারী ভোল্টেজ (primary voltage) 100V. N_p=375 এবং N_s=750 হয়।

Maximum Power Transfer Theorem :

In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a power source with internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.

For t<0, the switch is closed.

Capacitor acts as open to DC.

Voltage across the capacitor,

     v(0^-)= {(12||4)×V}÷{(12||4)+6} = 8VFor t=0, the switch is opened,Voltage across the Capacitor cannot change instantaneously,So, v(0^-)= v(0) = 8VAt t>0, The capacitor is discharging.R_th = (12||4) = 3 ohmC= 1/6 FTime constant, Π = R_th×C = 0.5 So, v(t) = v(0)e^-t/Π  = 8e^-t/0.5 =8e^-2t V (Ans.)