Electronics First Online Short Quiz

Electricity can travel at the speed of light. This is because electricity is the flow of electrons through a conductor, and electrons move at incredibly high speeds. The speed of light is considered the fastest speed in the universe, traveling at approximately 299,792 kilometers per second in a vacuum. Therefore, it is ideal to say that electricity can travel at the speed of light.

Alternating current (AC) is the correct answer because it is an electric current that changes direction periodically. It is commonly used in power supplies because it can be easily transformed to different voltages and transmitted over long distances with minimal energy loss. Unlike direct current (DC), which flows in only one direction, AC reverses its direction many times per second, typically at a frequency of 50 or 60 Hz. This characteristic of AC allows for efficient power generation, distribution, and utilization in various electrical devices and systems.

The last electron found at the outermost shell of an atom is called the valence electron. The valence electron is important because it determines the atom's chemical properties and how it will interact with other atoms to form compounds.

Before the invention of the telephone, the electric telegraph was the first communication network that utilized electricity. Electric telegraphs allowed messages to be transmitted over long distances through the use of electrical signals. This technology revolutionized communication by enabling faster and more efficient transmission of information compared to traditional methods such as postal mail or messengers. It paved the way for the development of more advanced telecommunication systems, including the telephone.

The neutron is the only particle of an atom that has no charge. It is located in the nucleus along with the positively charged protons. The neutron is neutral because it contains no electrical charge, unlike the proton which has a positive charge and the electron which has a negative charge. This lack of charge allows the neutron to interact with other particles in unique ways, contributing to the stability and behavior of the atom.

Thomas Edison is credited with inventions such as the first practical incandescent light bulb and the phonograph. He is known for his significant contributions to the field of electrical engineering and is considered one of the greatest inventors in history. Edison's inventions revolutionized the way we live and have had a lasting impact on society.

A transformer is needed to transform high voltage to the right voltage for appliances. Transformers work by using electromagnetic induction to transfer electrical energy between two or more circuits. They can step up or step down the voltage depending on the needs of the appliances. This allows for the safe and efficient use of electricity in homes and buildings.

Static electricity is often created when two objects that are not good electrical conductors are rubbed together. This rubbing causes electrons from one of the objects to transfer onto the other object, resulting in an imbalance of positive and negative charges. This accumulation of charges creates static electricity.

A material that allows electricity to flow freely through it is called a conductor. Copper wire is a good conductor of electricity due to its high electrical conductivity.

Refrigerators are the most power-hungry kitchen appliances because they are constantly running to maintain a cool temperature and keep food fresh. They require a significant amount of electricity to power the compressor, fan, and other components that regulate the temperature inside. On the other hand, microwave ovens, oven toasters, and blenders do not consume as much power as refrigerators since they are used for shorter periods of time and have smaller motors or heating elements.

An inverter is a device that converts direct current (DC) to alternating current (AC). It is commonly used in applications where AC power is required, such as in homes or businesses that use solar panels or batteries. Inverters are designed to provide a steady and reliable source of AC power by converting the DC power from a battery or other DC source into AC power that can be used to operate various electrical devices. Therefore, an inverter is the correct answer for a device that converts DC to AC.

A speaker is a transducer that converts electric signals into sounds. When an electric current passes through the speaker's coil, it creates a magnetic field that interacts with a permanent magnet, causing the coil to move back and forth. This movement produces vibrations in the speaker cone, which in turn creates sound waves that can be heard by our ears. Therefore, a speaker is the correct answer as it is specifically designed to convert electric signals into audible sounds.

Agapito Flores is credited as the first inventor of the fluorescent lamp. This invention revolutionized lighting technology by providing a more energy-efficient and longer-lasting alternative to traditional incandescent bulbs. Flores, a pinoy electrician, developed the concept of the fluorescent lamp, which utilizes a gas-filled tube to produce light when an electric current passes through it. His invention has had a significant impact on the lighting industry and is still widely used today.

Thales of Miletus is credited with discovering static electricity in 500 BC. Thales was an ancient Greek philosopher, mathematician, and astronomer who made significant contributions to various fields. He is known for his experiments with amber, which led to the discovery of static electricity. Thales observed that when amber was rubbed with fur, it attracted lightweight objects like feathers. This discovery laid the foundation for the understanding of electricity and its properties.

Electricity is the correct answer because it refers to a set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. It involves the flow of electric current through conductors, the generation of electric fields, and the interaction of electric charges.

Michael Faraday made significant contributions to the field of electromagnetism, including the discovery of electromagnetic induction, the invention of the electric motor, and the observation of the Faraday effect. However, wireless communication was not one of his specific contributions or discoveries. Faraday's work laid the foundation for the development of wireless technology, but he did not directly contribute to its invention or discovery.

A transducer that converts mechanical energy into electrical energy is called a Generator.

A Motor converts electrical energy into mechanical energy.

An Alternator is a type of generator that produces alternating current.

Rotor is a rotating part of a motor or generator, not the transducer itself.

The correct answer is "A World-Class University Producing Leaders and Change Agents for Social Transformation and Development". This answer accurately reflects the vision of Bicol University, which aims to be a world-class institution that produces leaders and change agents who can contribute to social transformation and development. The use of "world-class" emphasizes the university's commitment to excellence and global standards.

In the legendary story of Benjamin Franklin and the kite, he used a key as a conductor to attract lightning. The key played a crucial role in completing the electrical circuit and allowing Franklin to demonstrate the connection between lightning and electricity. Without the key, the story would not be complete as it is an essential element in the experiment.

The positively charged central part of an atom is called the nucleus. It contains protons, which have a positive charge, and neutrons, which have no charge. The electrons, which have a negative charge, orbit around the nucleus. Therefore, the correct answer is "Nucleus".