In 1–2 sentences, describe a setup of pith balls that have negative charges and are hanging from the same point.(2 points)

Question

In 1–2 sentences, describe the factors that affect the current (amperage) in an electric circuit.(2 points)
A team of students builds an electrical circuit with a battery and a fan. In 1–2 sentences, describe how energy is changed from one form to another in their electric circuit.(2 points)
In 1–2 sentences, explain how to make an electromagnet.(2 points)
In 1–2 sentences, explain how electromagnets move a maglev train.(2 points)

Answer 1

Pith Ball Setup: Two or more pith balls, each negatively charged, dangle from the same support point using thin threads, causing them to repel each other and spread apart due to the like charges.

Factors Affecting Current: The current (amperage) in an electric circuit is influenced by the voltage supplied by the battery and the total resistance of the circuit, as described by Ohm's Law (I = V/R).

Energy Transformation in a Circuit: In the electrical circuit built by the students, chemical energy from the battery is converted into electrical energy, which is then transformed into mechanical energy to power the fan.

Making an Electromagnet: To create an electromagnet, wrap a coil of wire around a ferromagnetic core (like iron) and connect the ends of the wire to a power source, allowing electric current to flow through the coil, generating a magnetic field.

Electromagnets and Maglev Trains: Electromagnets are utilized in maglev trains to produce a magnetic field that interacts with track-mounted magnets, creating lift and propulsion through magnetic repulsion and attraction, allowing the train to hover and travel at high speeds with minimal friction.