# Current flowing through LED

1. Feb 4, 2016

### Marcin H

1. The problem statement, all variables and given/known data

2. Relevant equations
V=IR

3. The attempt at a solution
I'm not sure if this is right, but I did this problem by finding the current in the 300ohm resistor by doing I=5V/300ohms = .0166A and since they are in series they have the same current. I don't think that is right though. The LED is 2V, so I'm not sure how to treat that.

2. Feb 4, 2016

### Jake 7174

The voltage across the resistor is not 5 v. What type of circuit is this (series / parallel). What do you know about the voltage and current in that type of circuit?

3. Feb 4, 2016

### Marcin H

It's a series circuit right? In series current is the same throughout the circuit and voltage is different. For parallel voltage is the same and current is different.

4. Feb 4, 2016

### cnh1995

Right. What is the voltage across resistor then?

5. Feb 4, 2016

### Marcin H

Im not sure. Would it be 3V? Va-Vb?

6. Feb 4, 2016

### Jake 7174

Good, Now, What is the current through the resistor

7. Feb 4, 2016

### Marcin H

.01A. So does that mean that .01A are flowing through the LED?

8. Feb 4, 2016

Yes.

9. Feb 4, 2016

### Jake 7174

In a series circuit is current constant?

10. Feb 4, 2016

### Marcin H

Yes. same current, different voltage.

11. Feb 4, 2016

### Jake 7174

There you go. Good job!!

12. Feb 4, 2016

Thanks!!!