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22 febrero 2011
21 febrero 2011
Serial and parallel circuits
SERIAL CIRCUITS
Two or more elements in a circuit are in serial when the output of one of the element is the input of the next one.
In this position, the current that flows through these elements is the same, but the total voltage is the addition of the voltages in each element. Which it has to be the battery value for the voltage.(REMEMBER that this rule is only true in this kind of circuits) Vt = V1 + V2
To calculate the equivalent resistor, you have to do the addition of each serial resistor. Req = R1 + R2
PARALLEL CIRCUITS
In this case, the different elements of the circuits are positioned to have the same input and the same output. Wires in both sides are together, as you can see in the draw:
In a parallel configuration, the voltage in each resistor is the same (the one marked by the battery), but the current in evey resistor is different. ( apply the Own's Law to calculate it)
The equivalent resistor is calculated using this equation:
1/R = 1/R1 + 1/R2 + ...
At last, to calculate the resistance in mix circuits remember to calculate the total resistance in each piece of circuit.
Images from:
http://usuarios.multimania.es/pefeco/resisserie/resserie.gif
http://usuarios.multimania.es/pefeco/resisparalel/resparalel.gif
Two or more elements in a circuit are in serial when the output of one of the element is the input of the next one.
In this position, the current that flows through these elements is the same, but the total voltage is the addition of the voltages in each element. Which it has to be the battery value for the voltage.(REMEMBER that this rule is only true in this kind of circuits) Vt = V1 + V2
To calculate the equivalent resistor, you have to do the addition of each serial resistor. Req = R1 + R2
PARALLEL CIRCUITS
In this case, the different elements of the circuits are positioned to have the same input and the same output. Wires in both sides are together, as you can see in the draw:
The equivalent resistor is calculated using this equation:
1/R = 1/R1 + 1/R2 + ...
At last, to calculate the resistance in mix circuits remember to calculate the total resistance in each piece of circuit.
Images from:
http://usuarios.multimania.es/pefeco/resisserie/resserie.gif
http://usuarios.multimania.es/pefeco/resisparalel/resparalel.gif
15 febrero 2011
Working with blogs
Last week we had some problems to make a blog in blogger because you were asked about your telephone number.
In the Internet exits a lot of altenatives to write a blog, so we are going to use another one which is called WORDPRESS.
You can find it in: http://es.wordpress.com
The task you have to do for today is:
1. Register yourself and activate your account.
The new blog must be called: your name technologyblog.
2. In the first post you must write an energy definition. Don't forget to write the links you have visited to do this task.
3. Look for the dashboard options and find in it the APPEARENCE. Change the theme (choose the one you like the most)
4. And include these two widgets: Blog Stats and a Calendar in the Primary Widget Area.
5. At the end, send me the direction of your new blog.
ALL OF YOU MUST HAVE YOUR OWN BLOG
In the Internet exits a lot of altenatives to write a blog, so we are going to use another one which is called WORDPRESS.
You can find it in: http://es.wordpress.com
The task you have to do for today is:
1. Register yourself and activate your account.
The new blog must be called: your name technologyblog.
2. In the first post you must write an energy definition. Don't forget to write the links you have visited to do this task.
3. Look for the dashboard options and find in it the APPEARENCE. Change the theme (choose the one you like the most)
4. And include these two widgets: Blog Stats and a Calendar in the Primary Widget Area.
5. At the end, send me the direction of your new blog.
ALL OF YOU MUST HAVE YOUR OWN BLOG
05 febrero 2011
How electricity works for us
Traducción del artículo de How stuff works, trabajado esta semana:
"Una de las propiedades más útiles de la electricidad es su habilidad para producir calor. La electricidad produce calor en un conductor cuando ésta vence la resistencia del conductor al paso de los electrones a su través, igual que la energía mecánica produce calor al vencer la fricción. El efecto de producir calor de la electricidad es usado en aparatos eléctricos como tostadores de pan, soldadores eléctricos y muchos otros dispositivos. En las bombillas incandescentes, este efecto es usado para hacer que el filamento brille.Otra propiedad muy útil de la electricidad es que puede ser una fuente de magnetismo: electrones atravesando un cable, crean un campo magnético alrededor del mismo.Este efecto es la base del funcionamiento de los electroimanes que hacen posible los motores eléctricos, teléfonos, altavoces, y muchos otros aparatos.
La electricidad tiene otras muchas aplicaciones. Puede crear una chispa entre dos conductores separados a una distancia muy pequeña. Una aplicación importante de esta chispa es la ignición de la gasolina en los cilindros del motor de gasolina. La electricidad también produce cambios químicos.
En un gas o en el vacío, los electrones pueden ser acelerados a gran velocidad y dirigidos en direcciones específicas. Los electrones usados de este modo hacen posible muchos tipos de aplicaciones, incluyendo los tubos de las pantallas de televisión, las luces fluorescentes, y los tubos de rayos X. En algunos dispositivos semiconductores, como los transistores, el movimiento de los electrones puede ser controlado por la electricidad. Estos dispositivos son usados en ordenadores, radios, grabadores, y muchos otros productos."
01 febrero 2011
Questions about electricity
Work in pairs to make this task.
Download here the worksheet. DON'T FORGET TO SAVE IT, BECAUSE AT THE END OF THE CLASS YOU HAVE TO EMAIL ME THE ANSWERS.
In the worksheet you will find a list of links. Below of each one, there is a list of questions.
For today you have to answer the questions number 4, 5, 6, 8, 10, 11, 12, 13, 14, 15, 17, 18, 23, 24, 25, 26, 27 and 28.
Once you have finished, remember to send the result of your investigation.
Download here the worksheet. DON'T FORGET TO SAVE IT, BECAUSE AT THE END OF THE CLASS YOU HAVE TO EMAIL ME THE ANSWERS.
In the worksheet you will find a list of links. Below of each one, there is a list of questions.
For today you have to answer the questions number 4, 5, 6, 8, 10, 11, 12, 13, 14, 15, 17, 18, 23, 24, 25, 26, 27 and 28.
Once you have finished, remember to send the result of your investigation.
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