Resistors
Alondra Trujillo
Meaning behind resistors!
a device having a designed resistance to the passage of an electric current.
Purpose: to create specified values of current and voltage in a circuit.
UNITS!
For measuring resistance is the OHM
Resistor Markings
Resistance value is marked on the resistor body. Most resistors have 4 bands.
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The first two bands provide the numbers for the resistance and the third band provides the number of zeros. The fourth band indicates the tolerance.
Training Video: "Resistor Color Codes" | McNaudio Media Solutions LLC (2009)
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Example of a circuit containing three resistors connected in parallel
Resistors in Parallel Circuits
Resistors can be connected such that they branch out from a single point (known as a node), and join up again somewhere else in the circuit.
Which is known as the parallel connection.
Resistors In Parallel
Calculate
- R1+R2+R3=Rtotal
Resistors in Series
- Resistors can be connected in series; that is, the current flows through them one after another.
Resistor Dissipation
If the flow of current through a resistor increases, it heats up, and if the temperature exceeds a certain critical value, it can be damaged. The wattage rating of a resistor is the power it can dissipate over a long period of time.
Wattage
Most commonly used resistors in electronic circuits have a wattage rating of 1/2W or 1/4W
The Resistor
This is a resistor
Parallel
This is how a resistor is on a parallel circuit
Dissipates Power
A graph that shows the different dissipations on a resistor