To determine the charging resistance value in a multi-stage impulse voltage generator,you can use the following formula:

　　$R=frac{V}{I}$

　　Where:

　　-$R$is the charging resistance value,

　　-$V$is the desired voltage output of the generator,and

　　-$I$is the charging current.

　　The charging resistance value is important in controlling the charging time of the generator and ensuring that the voltage rises at the desired rate.It helps in limiting the current flowing into the generator during the charging process.

　　Make sure to consider the specifications of the components in your generator circuit when calculating the charging resistance value.