The human body contains a significant amount of water and dissolved ions, which allow it to facilitate the flow of electric current. Therefore, it is considered a conductor of electricity, although its conductivity can vary based on skin moisture and other physiological factors.
15072
Which of the following substances acts as an electrical conductor?
Salt water is an electrolyte solution containing dissolved ions (sodium and chloride). These free-moving charged particles allow the solution to conduct electricity effectively, whereas pure water, rubber, and benzene are insulators or poor conductors due to the lack of free charge carriers.
15073
The flow of electric current through a metallic conductor is primarily attributed to the movement of which charge carriers?
In metallic conductors, the atoms are arranged in a lattice structure with delocalized valence electrons that are free to move throughout the material. When an electric potential difference is applied across the conductor, these free electrons drift in a specific direction, creating an electric current. Protons and ions are fixed within the lattice structure and do not contribute to the current flow in metals.
15074
What charge carriers are responsible for the flow of electric current through a metallic conductor?
In metallic conductors, atoms are arranged in a lattice structure where outer-shell electrons are loosely bound and free to move throughout the material. When an electric potential difference is applied across the wire, these free electrons drift in a specific direction, creating an electric current. Protons and ions remain fixed within the lattice structure and do not contribute to the current flow.
15075
In the context of standard circuit diagrams, what component is represented by the symbol typically depicting a glass bulb with a filament?
In electrical circuit schematics, standardized symbols are used to represent components. The symbol for an electric bulb is universally recognized as a circle containing a filament representation, distinguishing it from passive components like resistors or power sources like batteries.
15076
If two Coulomb of charge flows the cross-section of a conductor is one second, what will be the current flowing there?
Source answer preserved: option C (2 Amperes). AI attempted to change protected answer data (option_a, option_b), so this item is flagged for manual review before study use.
15077
Why does a bird perched on a high-voltage power line remain unharmed?
For an electric current to flow, there must be a potential difference across the body. Since the bird is touching only one wire, there is no potential difference between its feet, and it does not complete a circuit to the ground. Therefore, no current flows through the bird's body, preventing electrocution.
15078
What is the term for materials that facilitate the flow of electric current?
Conductors are materials, typically metals like copper or aluminum, that contain free electrons. These electrons are loosely bound to their atoms and can move easily through the material when an electric potential difference is applied, allowing current to flow.
15079
Which of the following statements accurately describes the charge carriers in metallic conductors?
In metallic conductors, the atomic structure consists of a rigid lattice of positive ions. The valence electrons are delocalized and free to move throughout the lattice under an applied electric field, while the positive ions remain fixed in their positions.
15080
In a metallic solid, which particles are primarily responsible for the conduction of electric current?
Metallic bonding is characterized by a 'sea' of delocalized electrons that are not bound to any specific nucleus. When an external electric field is applied, these free electrons gain a drift velocity, moving through the lattice structure of the metal. This collective movement of negatively charged electrons constitutes the electric current observed in metallic conductors.
