Exercise $3$: Voltage and current in an electric circuit

In the adjacent figure, $U_{PN}=12v$ and all the lamps are identical.

A$-$The switch $K$ is opened

Give the voltage across the switch K $.$

Calculate the voltage across each lamp. Justify your answer.

$B-$ The switch $K$ is closed and $U_{AB}=6V$

Redraw the figure then indicate the direction of the current in all the branches.

Give the voltage across lamp$1.$

Calculate $U_I$ then determine the voltage across lamps $2,3,4$ and $5,$ justify your answer.

Connect a voltmeter to measure the voltage across $L_5$ and indicate the common terminal to obtain positive reading.

If the main current sent by the generator is $500$ mA $.$ determine the current in each lamp.

If a connecting wire joins the points A and B $,$ what would happen to the brightness of the other lamps? Justify your answer.

Solve each step alone

Exercise $3$: Voltage and current in an electric circuit

In the adjacent figure, $U_{PN}=12v$ and all the lamps are identical.

A$-$The switch $K$ is opened

Give the voltage across the switch K $.$

Calculate the voltage across each lamp. Justify your answer.

$B-$ The switch $K$ is closed and $U_{AB}=6V$

Redraw the figure then indicate the direction of the current in all the branches.

Give the voltage across lamp$1.$

Calculate $U_I$ then determine the voltage across lamps $2,3,4$ and $5,$ justify your answer.

Connect a voltmeter to measure the voltage across $L_5$ and indicate the common terminal to obtain positive reading.

If the main current sent by the generator is $500$ mA $.$ determine the current in each lamp.

If a connecting wire joins the points A and B $,$ what would happen to the brightness of the other lamps? Justify your answer.