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Basic Electricity Section 2
Resistance and Ohms Law
13
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Undergraduate 1
10/23/2008

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Term
Resistance
Definition
Term for the property of "impeding" current flow. A material that is a conductor will have low resistance while a insulator will have very high resistance. The better the conductor, the lower the resistance. The better the insulator, the higher the resistance.
Term
Resistor
[image]
Definition
An electrical component used because it has a specific resistance. Resistors use color coded stripes to indicate their value and tolerance.

Term
Resistor Power Dissipation
Definition
Resistors are rated in power dissipation as well as resistance and tolerance. 1/4 and 1/2 watt resistors are most common, but higher and lower wattages are available. Power dissipation is usually indicated only by the size of the resistor.
Term
Resistors in Series
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Definition
The total resistance of resistors in series is found with simple addition of their values.
(R1 + R2 + R3 + ...)
Term
Resistors in Parallel
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Definition

The total resistance of resistors in parallel is found by using the following formula.
(1/R1 + 1/R2 + 1/R3 + ...= 1/RTOTAL)
Term
Series Circuits
Definition

Voltage: The voltage drop of components in series will add up to the total circuit voltage. Each component will drop a voltage proportional to its resistance (or impedance).

Current: The current through any component in a series circuit is the same as all other components and the circuit current.

Term
Parallel Circuits

Voltage:

Definition

Voltage: The voltage drop across components in a parallel circuit is the same as all other components and the total circuit voltage.

Current: The current through components in parallel will add up to the total circuit current. Current through each component will be proportional to its resistance (or impedance).

Term
Parallel Circuits

Current:

Definition

 The current through components in parallel will add up to the total circuit current. Current through each component will be proportional to its resistance (or impedance).

Term

Potentiometers

[image]

Definition
A special type of resistor that allows the resistance value to be adjusted. There are 3 connections to a potentiometer
Term

Potentiometers

Wiper - 

Definition
this connection "moves" closer (decreases resistance) to CW when the potentiometer (pot) is turned clockwise and farther from CCW. The opposite happens when it is turned counterclockwise.
Term

Potentiometers

CW(clockwise)

Definition
This connection has less resistance to the Wiper when the pot is turned clockwise, more when the pot is turned counter-clockwise. It always has the stated potentiometer resistance to CCW.
Term

Potentiometers

CCW(counter-clockwise)

Definition
This connection has less resistance to the Wiper when the pot is turned counter-clockwise, more when the pot is turned clockwise. It always has the stated potentiometer resistance to CW.
Term
OHMS LAW
Definition
V = IR
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