Electricity Part2

ELECTRICITY IES Río Cabe 1) ELECTRICITY AND MATTER. Mª Covadonga Yugueros 1.1. Conductor and insulators Valbuena 1.2. How to obtain electricity 1.3. The transport of electric energy 1.4. Effects of electric current 2)Electric quantities 2,1. Electric current 2.2. Voltage 2.3. Resistance.

3) Ohm's law 4)Electric circuits 4.1. Components of an electric circuit 4.2. Representation and symbols.

5)Types of circuits.

5.1. Series circuits 5.2. Parallel circuits 5.3. Series-parallel combination circuits

2,Electric quantities The basic electric quantities or variables are

Current Intensidad de corriente

Variables

Voltage or potential difference Voltaje o tensi贸n

Resistance Resistencia

2.1. Electric current What is the intensity of traffic?

How can we measure it?

Electrons

In electricity, which are moving

Electric current (I) is the amount of electrons flowing through a conductor for a time

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little current

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A lot of current

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Electric current II Electric current is represented by the letter It is represented:

Its unit of measurement (SI)

Amperes or Amps

A

Amperio

Es la intensidad que circula por un punto de un conductor cuando por ĂŠl pasa un culombio de carga en un segundo.

1 Ampere

1 Coulomb

6.240.000.000.000.000.000 electrons

To measure the current we use the ammeter AmperĂ­metro

2.2. Voltage o Potential difference For a flow of current there must be a different energy level between two points of the circuit: One point with a high number of electrons and the other with a low number.

This difference between the electrical energy at two points in a circuit is called Voltage.

The amount of energy that a battery is able to supply electrons the force that causes a current to flow

Voltage

Voltage o Potential difference II Voltage is represented by the letter

Its unit of measurement (SI)

Volts Voltios

To measure the current we use the Voltmeter VoltĂ­metro

It is represented:

V

2.3. Electric resistance The resistance is the opposition of the components of a circuit to the flow of electric current.

Electric resistance is represented by the letter

Its unit of measurement (SI)

Ohm

It is represented:

Ohmio

Conductors

Low resistance

Materials Insulators

High resistance

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Electric Resistance II

ge a im e h nt o ck i l C

material

The resistance of an element depends on Length

More legth

More Resistance

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Less length Less Resistance

Section More Section

Less Section

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More Resistance

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Less Resistencia

clic k

Electric variables

3. Ohm's law

Voltage Current

The three electric quantities

Resistance The relationship between current, voltage and resistance was discovered by George Simon Ohm in SXIX : Ohm's law

Ohm law: Voltage in a circuit is directly proportional to the current flowing and to the resistance that exists.

Link 1 V I

Link 2 R