Calculating Internal Resistor in a Series Battery Circuit

In summary, the conversation is about helping someone solve a problem involving a battery formed by four 1.5 V identical cells in series and an external resistor of 31 Ohms. The current through the resistor is given as 280 mA and the goal is to find the internal resistor of each cell. After several attempts, it is determined that the given information does not match and the question may need to be clarified with the lecturer.
  • #1
helper-
3
0

Homework Statement



Helping someone regarding this Qns:

A Battery is formed by four 1.5 V identical cell in series. When a external resistor of 31 Ohm is connected across he battery, the current is 280 mA. Find the internal resistor of each cell.

Can someone help to solve pls?

Thank you loads (:

Homework Equations



V = E - Ir ?

The Attempt at a Solution

 
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  • #2
helper- said:
1. V = E - Ir ?



No, try R = E/i
 
  • #3
R = e / i = 6V / 0.290A = 21.43 Ohms

**is this is less than the load resistance of 31 Ohms?

The answer given is 0.19 Ohms; but unable to solve. Any idea?
 
  • #4
helper- said:
R = e / i = 6V / 0.290A = 21.43 Ohms

**is this is less than the load resistance of 31 Ohms?

The answer given is 0.19 Ohms; but unable to solve. Any idea?

It's 0.290 A, not 0.280.

What limits the current thru the 31 ohm resistor?
 
  • #5
something wrong here ! 6V emf, current of 0.28A means total R = 6/0.28 =21.4 ohms
Does not fit with external resistance of 31 ohms connected.
Check the question
 
  • #6
truesearch said:
something wrong here ! 6V emf, current of 0.28A means total R = 6/0.28 =21.4 ohms
Does not fit with external resistance of 31 ohms connected.
Check the question

That's right, it's impossible.
 
  • #7
*opps type on the 0.28.

Thanks all! Guess have to check with the lecturer, seems the qns is wierdddd. (:
 

FAQ: Calculating Internal Resistor in a Series Battery Circuit

What is an internal resistor?

An internal resistor is a component within a circuit that limits the flow of current. It is typically used to regulate or control the amount of current in a circuit.

How can I find the internal resistor in a circuit?

The internal resistor can be found by examining the circuit diagram or by physically inspecting the components within the circuit. It is often labeled as "R" in a circuit diagram.

Why is it important to find the internal resistor in a circuit?

Knowing the value of the internal resistor is important for understanding the behavior and performance of the circuit. It also helps in troubleshooting and making necessary adjustments to the circuit.

Can the internal resistor be replaced or removed?

In most cases, the internal resistor is an integral part of the circuit and cannot be easily replaced or removed. However, in some cases, it may be possible to bypass or modify the internal resistor to achieve a desired result.

What factors determine the value of the internal resistor?

The value of the internal resistor is determined by the design of the circuit and its intended purpose. It may also be influenced by external factors such as temperature and voltage. In some cases, the value of the internal resistor can be adjusted or changed to alter the behavior of the circuit.

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