# What is the voltage across battery terminals?

Tags:
1. Mar 14, 2016

### neilson18

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

Three resistors are connected to a real battery. The open circuit voltage of the battery is 4.5 Volts. The voltage across the 5 Ohm resistor is 2.5 Volts.

A) What is the voltage across battery terminals?
B) What is the internal resistance of the battery?

Here's a picture of the circuit: http://imgur.com/7IdSn3I

2. Relevant equations

Junction Law: Sum of Current in = Sum of Current out

3. The attempt at a solution

I understand how a real battery has an internal voltage and resistance, but I don't know how the information here relates to that. I tried using the Junction Law to find different Currents I_1 and I_2 but even after getting those I didn't know how to relate that to the questions.

2. Mar 14, 2016

### Staff: Mentor

Can you show what calculations you've done and which currents you've found (they were not marked on your figure)?