Lecture Notes on Electricity and Electronics

Flashcards covering key topics from lecture notes on electricity and electronics.

What is matter?

Matter is anything that takes up space and has mass.

What are the three states of matter?

Solid, liquid, and gas.

Define an element.

An element is the purest form of any substance.

What is a compound?

A mixture of two or more elements.

What is a molecule?

The smallest part of a compound that retains all characteristics of that compound.

What is an atom?

The smallest form of an element.

What is the nucleus of an atom?

The center of an atom that contains protons and neutrons.

What do protons have?

A positive charge.

What do neutrons have?

No charge.

What is the atomic number of an element?

The number of protons or electrons in an atom of that element.

What is ionization?

The process of an atom gaining or losing electrons, which causes it to become electrically unbalanced.

What is static electricity?

Electricity at rest.

What does the law of charges state?

Like charges repel each other, while unlike charges attract each other.

What is the coulomb?

A unit used to measure electricity, represented by $6.24 imes 10^{18}$.

What is an electrostatic field?

The force surrounding a charged body.

What is required for charges to transfer?

Direct contact or induction.

What are the three main parts of an electrical circuit?

Conductors, source, and load.

What does voltage represent?

The force behind electron movement, also called electrical pressure.

What is current?

The flow of electrons, represented by the letter I or the unit A (ampere).

What is resistance?

The opposition to current flow, measured in ohms (Ω).

What are the two types of electrical current?

Direct current (DC) and alternating current (AC).

What is direct current (DC)?

Electric current that flows in one direction.

What is alternating current (AC)?

Electric current that flows in both directions.

What does hertz (Hz) measure?

The frequency of AC, indicating how often it changes direction.

What are Kirchhoff's laws?

Laws that govern current and voltage in electrical circuits.

What are the differences between analog and digital multimeters?

Analog meters use a scale and continuous variable values, while digital meters provide discrete values displayed on a screen.

What is an ammeter used for?

To measure electrical current in a circuit.

What is a voltmeter used for?

To measure voltage in a circuit.

What is an ohmmeter used for?

To measure resistance.

What is the National Electrical Code (NEC)?

A standard that requires all electrical circuits above 50 volts to have a ground for safety.

What type of outlet protects against excessive current passing through the human body?

Ground Fault Interrupter (GFI) outlet.

What can electric shocks cause?

Different levels of severity, ranging from barely noticeable to fatal.

What type of drawings are used for electrical diagrams?

Schematic, line, wire, and block diagrams.

What are conductors?

Materials that allow the flow of electricity.

What is power?

The rate at which electrical work is done.

What is Watt's Law?

The power of any circuit is equivalent to the voltage multiplied by the current.

What is a generator?

A device that changes mechanical energy into electrical energy.