Gas Fitter Practice Test

What is Ohm's Law?

1. Resistance = current / voltage

2. Current = voltage / resistance

3. A potential of 2 volts across a resistance of 1 ohm will produce a current of 1 amp.

4. A potential of 1 volt across a resistance of 1 ohm will yield a flow of a 1 amp current.

The correct answer is: Current = voltage / resistance

Ohm's Law is a fundamental principle in electrical engineering that defines the relationship between voltage, current, and resistance. It can be expressed mathematically as \( V = I \times R \), where \( V \) is voltage, \( I \) is current, and \( R \) is resistance. When rearranged, it can also be represented as \( I = V / R \), which is exactly what is presented in the chosen answer. Understanding Ohm's Law is crucial for gas fitters and other professionals dealing with electrical components in gas systems, as it allows them to accurately calculate the necessary electrical parameters to ensure proper function and safety. The other options present variations or specific examples of Ohm's Law, but they do not provide the general formula that applies to all scenarios involving these three electrical parameters. For instance, while the statement about the potential of 2 volts producing a current of 1 amp gives a specific case based on Ohm's Law, it doesn’t encapsulate the complete relationship. Similarly, the statement regarding a potential of 1 volt and a resistance of 1 ohm yielding 1 amp is a specific application of the law and is not a formula representation. The first option inaccurately presents the relationship