## Charging capacitor – transient state

Electrical circuit is built with:

• voltage source E

• resistor R

• switch X1

• capacitor C

Capacitor has collected an initial charge Q_{0} between its electrodes, thus, it has an initial voltage U_{C0}=Q_{0}/C.

Switch X1 is being closed at specific time, thus, current i(t) starts to flow in circuit. Immediately after closing the switch X1 the **transient state** occurs in electrical circuit, therefore, **commutation principles** have to taken under consideration. Kirchhoff’s voltage law equation will be written for circuit. General formula for capacitor’s current will be taken under consideration.

Charging capacitor – transient state

## Discharging capacitor – transient state

Electrical circuit is built with:

• voltage source E

• resistor R

• switches X1, X2

• capacitor C

Capacitor was being charged with to its full capacity and it is in stable state. Capacitor initial voltage is equal to voltage source U_{C0}=E.

Switch X2 is being closed and switch X1 is being opened, both switches change their state in the same time. As a result capacitor’s discharging current i(t) starts to flow in circuit. Immediately after closing the switch X2 the **transient state** occurs in electrical circuit, therefore, **commutation principles** have to taken under consideration. Kirchhoff’s voltage law equation will be written for circuit. General formula for capacitor’s current will be taken under consideration.

Discharging capacitor – transient state

## Charging inductivity – transient state

Electrical circuit is built with:

• voltage source E

• resistor R

• switch X1

• inductivity L

Switch X1 is being closed at specific time, thus, current i(t) starts to flow in circuit. Immediately after closing the switch X1 the **transient state** occurs in electrical circuit, therefore, **commutation principles** have to taken under consideration. Kirchhoff’s voltage law equation will be written for circuit. General formula for inductivity’s current will be taken under consideration.

Charging inductivity – transient state

## Discharging inductivity – transient state

Electrical circuit is built with:

• voltage source E

• resistor R

• switches X1, X2

• inductivity L

Switch X2 is being closed and switch X1 is being opened, both switches change their state in the same time. As a result inductivity discharging current i(t) starts to flow in circuit. Immediately after closing the switch X2 the **transient state** occurs in electrical circuit, therefore, **commutation principles** have to taken under consideration. Kirchhoff’s voltage law equation will be written for circuit. General formula for inductivity’s voltage will be taken under consideration.