Electrical Concepts and Principles

What are the three main particles that make up an atom?

• Protons, Neutrons, Ions

• Electrons, Protons, Molecules

• Protons, Neutrons, Electrons

• Quarks, Leptons, Bosons

Which type of material allows electrons to flow freely?

• Insulators

• Conductors

• Semiconductors

• Resistors

When a power source is connected to a copper wire in a closed circuit, how do the free electrons behave?

• They stop moving completely.

• They move randomly in any direction.

• They flow in the same direction.

• They move towards the negative terminal.

What does voltage represent in an electrical circuit?

• The amount of heat produced.

• The restriction to the flow of electrons.

• The pushing force of electrons.

• The number of electrons flowing per second.

Which of the following factors can affect the resistance of a wire?

• Only the length of the wire.

• Only the material of the wire.

• The length, thickness, material, and temperature of the wire.

• The color and shape of the wire.

What is the primary function of a resistor in an electrical circuit?

• To increase the flow of current.

• To protect components by restricting current flow.

• To convert electrical energy into mechanical energy.

• To store electric charge.

How does electrical resistance lead to the production of light and heat in certain materials?

• Electrons gain energy and become visible.

• Atoms generate heat when they collide with electrons, and at a certain temperature, they produce light.

• The material's chemical composition changes, releasing energy.

• Magnetic fields are created, which then emit light.

Which of the following methods can increase the strength of the magnetic field produced by an inductor?

• Decreasing the number of coil turns.

• Increasing the amount of current passing through the circuit.

• Using a non-magnetic core.

• Reducing the current flow.

What common electrical device operates on the principle of electromagnetic induction to produce electricity for homes?

• Resistor

• Capacitor

• AC generator

• Transformer

What is the primary difference between Alternating Current (AC) and Direct Current (DC)?

• AC flows in one direction, while DC flows back and forth.

• AC is used in batteries, while DC is used in wall sockets.

• AC constantly reverses its direction of flow, while DC travels in only one direction.

• AC is produced by solar panels, while DC is produced by generators.