G2 Gas Fitter Practice Exam

Electrical current in a wire can induce what effect in another material?

1. A thermal reaction

2. An electrical charge

3. A chemical reaction

4. A mechanical vibration

The correct answer is: An electrical charge

Electrical current in a wire can induce an electrical charge in another material through the principle of electromagnetic induction. When a current flows through a conductor, it creates a magnetic field around it. If another conductive material is placed within this magnetic field and there is a change in the magnetic flux, it can induce an electromotive force (EMF) in that material, resulting in the generation of an electrical charge. This phenomenon is foundational for many electrical devices, such as transformers and generators, where electromagnetic induction is utilized to transfer energy between circuits or produce electricity. Understanding this effect is critical for gas fitters, as it relates to safety and the proper functioning of various electrical components in gas systems. The other options don't reflect the direct relationship of current and charge induction. While thermal reactions may occur due to resistance, they are not a direct result of the induced effect. Chemical reactions can take place in certain conditions, but they are not primarily an outcome of electrical current in a wire acting on another material. Mechanical vibrations can occur, but they are typically associated with physical motion rather than charge induction.