Power Supplies Cell Component

Power Supplies

Cell Component

Circuit Symbol

Function of Component 

Supplies electrical energy. The larger terminal (on the left) is positive (+). A single cell is often called a battery, but strictly a battery is two or more cells joined together. 

Battery Component

Circuit Symbol

Function of Component 

, Supplies electrical energy. A battery is more than one cell. The larger terminal (on the left) is positive (+). 

DC supply Component

Circuit Symbol

Function of Component 

, Supplies electrical energy. DC = Direct Current, always flowing in one direction. 

AC supply Component

Circuit Symbol

Function of Component 

, Supplies electrical energy. AC = Alternating Current, continually changing direction. 

Fuse Component

Circuit Symbol

Function of Component 

, A safety device which will 'blow' (melt) if the current flowing through it exceeds a specified value.. 

Transformer Component

Circuit Symbol

Function of Component 

, Two coils of wire linked by an iron core. Transformers are used to step up (increase) and step down (decrease) AC voltages. Energy is transferred between the coils by the magnetic field in the core. There is no electrical connection between the coils. 

Earth (Ground) Component

Circuit Symbol

Function of Component 

, A connection to earth. For many electronic circuits this is the 0V (zero volts) of the power supply, but for mains electricity and some radio circuits it really means the earth. It is also known as ground. 

Ideal independent source

Circuit Symbol

Function of Component 

An ideal independent source is an active element that provides a specified voltage or current that is completely independent of other circuit elements.

Ideal dependent (or controlled) source

Circuit Symbol

Function of Component 

An ideal dependent (or controlled) source is an active element in which the source quantity is controlled by another voltage or current.

There are four type of dependent source

A voltage-controlled voltage source (VCVS).

A current-controlled voltage source (CCVS).

A voltage-controlled current source (VCCS).

A current-controlled current source (CCCS).