Physics | Electric circuits | Circuits with switches

This lesson is relavant for Grade 12 DBE, IEB and A-level Physical Science.

In this lesson, we look at how switches affect the movement of current in a circuit. Together with the previous lessons on circuits, you will now understand, with good reason how each of the elements (voltage, current and internal resistance) get affected when a switch is either opened or closed in a circuit.

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[saneleterence]

Good day sir, is current directly proportional to Vext .... asking because of 9.2.3 am confused 😩🙏. Can you please explain it futhi

[AD-hrxf]

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[siyandablessing]

but uncle Mlu your 9.2.2 i really tried to understand but i think you may have changed the question by mistake seeing that you assumed that current will decrease where as the question has not said that

[siyandablessing]

remember in the previous video we said if switch is open then V(ext)=Emf and if swicthed is closed then V(ext)<Emf