$A$ device is connected to a supply such that one end is connected to the positive terminal and the other to the negative terminal. If the connections are reversed and no current flows,the device is a .......

For diode $D_1$,the forward bias resistance is $20 \ \Omega$ and the reverse bias resistance is $600 \ \Omega$. For diode $D_2$,the forward bias resistance is $30 \ \Omega$ and the reverse bias resistance is $200 \ \Omega$. Find the equivalent resistance between $A$ and $B$ if $(i)$ $A$ is at a higher potential,and $(ii)$ $B$ is at a higher potential.

In the reverse biasing of a $p-n$ junction diode,

In a semiconductor diode,the forward voltage is increased from $0.5 \ V$ to $0.7 \ V$. As a result,the forward current changes by $1 \ mA$. The forward resistance of the diode is ....... $\Omega$.

What is forward bias and reverse bias?

What is the current in the circuit shown below?