jueves, 11 de junio de 2015
martes, 2 de junio de 2015
ELECTRICITY EXAM
DEFINITION OF ELECTRICITY: movement of electrons
ELECTRIC CURRENT: Is the flow of electrons around a circuit
ELECTRIC CIRCUIT: is a route around which electrons circulate. It consist of a generator, a switch, a cable and a receiver
SYMBOLS:
In an electric diagram we use straight lines and right angles. For example compare the real components and the diagram:
ELECTRIC MAGNITUDES:
INTENSITY: is the number of electrons that flows through a conductor in a second. We measure it in Amperes (A). 1 Ampere = 6 trillions of electrons in movement!!!!!
VOLTAGE: is the energy we give to the electrons. The more voltage the more energy the electrons have in the circuit. We measure in volts (V).
RESISTANCE: is the opposition to the movement of electrons. We measure it in ohms (we use the letter omega for the unit)
The 3 magnitudes are related with the Ohm's Law. You can check the next post (in spanish) in the blog with the formulas you have to use for the problems.
Page of exercises.
Page with the solutions (In spanish).
Good luck in the exam!!!
ELECTRIC CURRENT: Is the flow of electrons around a circuit
ELECTRIC CIRCUIT: is a route around which electrons circulate. It consist of a generator, a switch, a cable and a receiver
SYMBOLS:
In an electric diagram we use straight lines and right angles. For example compare the real components and the diagram:
INTENSITY: is the number of electrons that flows through a conductor in a second. We measure it in Amperes (A). 1 Ampere = 6 trillions of electrons in movement!!!!!
VOLTAGE: is the energy we give to the electrons. The more voltage the more energy the electrons have in the circuit. We measure in volts (V).
RESISTANCE: is the opposition to the movement of electrons. We measure it in ohms (we use the letter omega for the unit)
The 3 magnitudes are related with the Ohm's Law. You can check the next post (in spanish) in the blog with the formulas you have to use for the problems.
Page of exercises.
Page with the solutions (In spanish).
Good luck in the exam!!!
jueves, 28 de mayo de 2015
Electricidad 3º ESO. Fórmulas para recordar
Resistencias en serie:
Resistencias en paralelo:
Si sólo tenemos 2 resistencias en paralelo:
Fórmula de la potencia. Recuerda la potencia se mide en Watios (W)
Fórmula de la Energía:
E = P·t
Energía = Potencia · tiempo
Si ponemos la potencia en watios y el tiempo en segundos la energía nos saldrá en Julios.
La energía en el sistema internacional se mide en Julios (J), pero en electridad se usa el KiloWatio·hora (kW·h)
Resistencias en paralelo:
Si sólo tenemos 2 resistencias en paralelo:
Si además las dos resistencias son iguales la Rt es igual a la mitad del valor de las 2 que tenemos en paralelo.
Ley de Ohm:
Fórmula de la potencia. Recuerda la potencia se mide en Watios (W)
E = P·t
Energía = Potencia · tiempo
Si ponemos la potencia en watios y el tiempo en segundos la energía nos saldrá en Julios.
La energía en el sistema internacional se mide en Julios (J), pero en electridad se usa el KiloWatio·hora (kW·h)
lunes, 18 de mayo de 2015
domingo, 17 de mayo de 2015
4º ESO. El diferencial de una instalación eléctrica
Pincha sobre la imagen para ver una explicación sobre el funcionamiento del diferencial de una instalación eléctrica:
domingo, 10 de mayo de 2015
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