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Chapter 25: Problem 11

A student who's confused about voltage and current hooks a nearly ideal ammeter across a car battery. What happens?

Short Answer

Expert verified
A substantial current will flow through the ammeter due to its almost zero internal resistance when it is directly connected across the battery. This misconnection forms a short circuit that could damage the ammeter and potentially create a dangerous situation.

Step by step solution

01

Understand the Characteristics of an Ideal Ammeter

An ideal ammeter is a device used to measure electric current in a circuit and it has almost zero internal resistance. This low resistance is ideal for its role in a circuit, as it is intended to be connected in series with a component to measure the current flowing through it without significantly changing the current.
02

Understand the Effects of directly connecting an Ideal Ammeter to a Battery

However, when an ideal ammeter is directly connected across a power source such as a battery, it acts like a piece of wire, or a short circuit. For a car battery having substantial voltage, direct connection of an ammeter would enable a large current to flow through the ammeter.
03

Predict the Consequence of the Misconnection

So, in this scenario, the large current that results from the short circuit will likely damage or destroy the ammeter. Moreover, it can even cause harm to the student and can lead to a dangerous situation such as a fire due to overheating.

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