Diode in Parallel Circuit: Effects on Current Flow

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In a parallel circuit with a resistor and a diode, when the diode is forward-biased, it acts as a conductor with negligible resistance, allowing most current to flow through it. While some current may still pass through the resistor, this amount is minimal and often considered insignificant in ideal conditions. The diode's orientation is crucial for it to function correctly in this setup. In real-world scenarios, neither the diode nor the resistor has perfect resistance values, but for basic calculations, the understanding that current primarily flows through the diode is accurate. Thus, the presence of the diode significantly influences current distribution in the circuit.
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What would happen if u had a circuit that was earthed at a point and it had an EMF of let's say 9V. If i had 1 resistor and immediately after that i had a resistor and diode in parallel, would any current enter the resistor. My understand is that it wouldn't since once the diode opens up, it effectively acts as a conductor of 0 resistance. With this being the base, does all the current pass into the diode?
 
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Your understanding is correct (the diode must be oriented in the correct manner, of course).

Keep in mind that we're talking "ideal" conditions. A diode is considered to have zero resistance in one direction and infinite resistance in the other. But in reality, nothing has truly zero, nor infinite resistance.

There would be a tiny current that goes through the resistor in parallel with the diode, but it is mostly insignificant. So you are "correct enough" for basic problems.
 

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