What is the voltage across battery terminals?

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SUMMARY

The voltage across the battery terminals in the given circuit is 2.0 Volts, calculated by subtracting the voltage drop across the 5 Ohm resistor (2.5 Volts) from the open circuit voltage (4.5 Volts). The internal resistance of the battery can be determined using the formula V = I(R + r), where V is the open circuit voltage, I is the current through the circuit, R is the load resistance, and r is the internal resistance. The internal resistance is found to be 1.0 Ohm based on the calculated current and voltage values.

PREREQUISITES
  • Understanding of Ohm's Law and circuit analysis
  • Familiarity with the concept of internal resistance in batteries
  • Knowledge of the Junction Law in electrical circuits
  • Ability to perform voltage and current calculations in series circuits
NEXT STEPS
  • Study the relationship between open circuit voltage and internal resistance in batteries
  • Learn how to apply Kirchhoff's laws in circuit analysis
  • Explore practical applications of internal resistance in battery performance
  • Investigate methods for measuring battery voltage and internal resistance
USEFUL FOR

Students studying electrical engineering, circuit designers, and anyone interested in understanding battery behavior in real-world applications.

neilson18
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Homework Statement


[/B]
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
upload_2016-3-14_21-18-11.png


Homework Equations



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

The Attempt at a Solution


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

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