Units and Symbols
Circuit Elements
Miscellaneous!
100
This unit measures electric charge.
What are Coulombs?
100
This small electronic part gives off light when electricity flows through it. It's often used in displays, indicators, and flashlights.
What is an LED?
100
This is a subatomic particle with a negative one elementary electric charge. When you look at an atom, this subatomic particle is one of three different types.
What is an electron?
200
An electric current is a flow of charged particles, such as electrons or ions, moving through a medium. Current is taken to be flowing in the direction opposite to the flow of electrons. It is measured with this unit.
What are Amperes (A)?
200
This part stores electrical energy by holding charges on two separated surfaces. It's often used in timing circuits and power supplies.
What is a capacitor?
200
These materials let electricity flow easily because their electrons move freely. Metals like copper and aluminum are common examples.
What are conductors?
300
Voltage, also known as (electrical) potential difference, or electric pressure, is the difference in electric potential between two points. It is measured with this unit.
What are Volts (V)?
300
This element is a semiconductor device that acts as a one-way valve for electrical current, allowing it to flow more easily in one direction (forward bias) than the other (reverse bias).
What is a diode?
300
These materials do not let electricity or heat pass through them easily. They are often solids like rubber or plastic and are used to keep electrical parts safely separated.
What are insulators?
400
This is what makes things attract or repel in electricity. It can be positive or negative.
What is electric charge (q)?
400
This element is a semiconductor device used to amplify or switch electrical signals and power. It is typically composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit.
What is a transistor?
400
These are used for things like processing information, communication, and automation. Some can also turn electrical energy into heat or movement, like in heaters or motors.
What are electrical devices?
500
The electrical resistance of an object is a measure of its opposition to the flow of electric current. It is measured with this unit.
What are ohms (Ω)?
500
This component limits the amount of electric current in a circuit, converts excess electrical energy into heat, and is often used to control voltage and protect other parts of the system.
What is a resistor?
500
This reusable object lets you build and test circuits without soldering. Though easy to use, its connections can be less reliable and affected by movement or wear.
What are breadboards?