The z-parameters of a two-port circuit are z11 1 kV, z12 z21 500 V,

The z-parameters of a two-port circuit are z11 ¼ 1 kV, z12 ¼ z21 ¼ 500 V, and z22 ¼ 1:5 kV. Find the port currents I1 and I2 when a 12-V voltage source is connected across the input port and a load resistor RL ¼ 250V is connected across the output port.