Equivalent Resistance

Ohm's Law in a Series Circuit 1

Open Ended

If Ohm’s Law states that R = V/I, then determine the potential difference across a 3 ohm resistor with a current of 2 A.

Open Ended

Name one piece of information that you can get from this circuit.

Single Pathway

• In a series circuit there is only one path, positive to negative, so the total current of the system is the current everywhere.  We will explore what this means at individual points next week.

• What would happen if a piece of the circuit stops working?

Equivalent Resistance

• Equivalent Resistance (Req) is the total resistance of a circuit.

• In a series circuit, you find the equivalent resistance by adding all the resistors.

• What is the equivalent resistance of this system?

Finding missing variable.

• Req = 9 ohms

  What other information can you get from the diagram?

• V = 9V

• I = I

• How can we find the current?

Open Ended

What is the equivalent resistance of the diagram pictured here.

Open Ended

Besides from the equivalent resistance, what other information can I obtain from the diagram pictured here?

Open Ended

Determine the potential difference of the diagram pictured here.

From previous slides we obtained:

R = 12 ohms

I = 2 A

V = V

Ohms Law: R = V/I

Steps:

Lets Review the steps of solving this problem: