Circuit Current: How to Calculate IA, IB, IC, ID

AI Thread Summary
To calculate the currents IA, IB, IC, and ID in a circuit, understanding the relationship between voltage and current is essential, as the circuit will draw current based on the voltage supplied and the impedance of the components. The current before the LEDs (ID) is measured at approximately 180mA, which indicates the need to consider both voltage specifications and voltage drops across components for accurate calculations. Modeling the circuit with ideal components can simplify the analysis, but it's important to account for the equivalent impedances of real components. The level of detail required in calculations will depend on the specific needs of the project. Clarifying these concepts will enhance understanding of current behavior in various circuits.
sandeep agari
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hello,
while making a circuit ( uploaded pic) ,the specifications of leds are 50mA/2V, i found the current ( ID )just before the leds to be around 180mA. i just want to know how to determine the currents in the circuit at various points( IA, IB , IC, ID). in general i want to know how to determine how a circuit draws current . do we have to take care of only voltage speciafications, voltage drops only and it will draw current automatically? just confused with the current calculations in this circuit. i hope if this will be cleared then it will help a lot in all others:) must respond.
 

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Welcome to PF;
The circuit powered from a voltage source will draw a current automatically (up to the limits of the equipment)... potential difference and current are related.
Typically you would model the real-life circuit as a circuit of ideal components - for this you need to know the equivalent impedences of the real components and how to model them as ideal components. How far you take it depends on how much detail you need.
 

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