# Cause & Effect: Ammeter Resistance & Circuit Current

• phyphysics
In summary, the conversation is discussing a question in a physics book where there are two statements and the individual must choose whether the second statement is an explanation of the first statement or not. The answer provided was a, but based on personal interpretation, the answer should be b. The conversation also suggests that the question is poorly written and suggests a different interpretation of the question.
phyphysics
I have such a question in my physics book:

There are 2 statements below. Choose a if the second statement is an explanation of the first statement; otherwise, choose b :

1. Ammeter has a very small resistance.

2. The current in the circuit can be said negligibly affected when the ammeter is connected in series with it correctly.

I thought the answer should be b , as I thought that statement 1 should be the explanation of statement 2, not vice versa. But the answer said is a . Why?

I would agree with you. Personally that's a very confusing and badly written question.

~Lyuokdea

Allow me to lend my support, gents. It might be a matter of semantics, though; Statement #1 is definitely the basis for Statement #2, but might not necessarily be an explanation for it. Regardless, it's a very poorly presented problem. Given the same choice that you were, I would have chosen similarly.

In the future I suggest interpreting it as:

Choose a if the second statement explains why the first statement is true; otherwise, choose b :

2 is true *because* 1 is true. The ammeter has low resistance *because* it was made that way (Aristotle's Effective Cause), not because it has a negligible effect on the current.

yeah. the reason that there is a negligible effect is that there is a small resistance. besides, the wording in 2 is that "it can be said". so now the question is, why can this be said?

## 1. What is the relationship between ammeter resistance and circuit current?

The ammeter resistance and circuit current have an inverse relationship. This means that as the resistance of the ammeter increases, the circuit current decreases, and vice versa.

## 2. How does the resistance of an ammeter affect the accuracy of the current measurement?

The resistance of an ammeter can affect the accuracy of the current measurement by causing a voltage drop in the circuit. This voltage drop can result in a lower current reading than the actual value. Therefore, a lower resistance ammeter is more accurate in measuring circuit current.

## 3. Can the resistance of an ammeter be ignored in circuit analysis?

No, the resistance of an ammeter cannot be ignored in circuit analysis. It is an integral part of the circuit and can affect the overall behavior and accuracy of the measurements. It is important to take into account the resistance of the ammeter when analyzing a circuit.

## 4. How can the resistance of an ammeter be minimized?

The resistance of an ammeter can be minimized by using a thinner wire for the ammeter coil, reducing the number of turns in the coil, and using a higher conductivity material for the wire. However, the resistance cannot be completely eliminated and should be considered in circuit analysis.

## 5. How does the placement of an ammeter in a circuit affect the current measurement?

The placement of an ammeter in a circuit can affect the current measurement by altering the flow of current in the circuit. Ideally, an ammeter should be connected in series with the circuit component that is being measured. If it is connected in parallel, it can create a new path for the current, leading to inaccurate measurements.

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