sábado, 25 de marzo de 2017


ELECTRICAL QUANTITIES

VOLTAGE OR POTENTIAL DIFFERENCE
The amount of energy that a generator can transfer to electrons depends on its voltage (V) or electric tension. This is measured in volts (V)


Resultado de imagen de voltage

If we want to measure voltage, we can use a volmeter and it must be connected in parallel.


Resultado de imagen de voltmeter     Resultado de imagen de voltmeter 



MEASURING ELECTRIC CURRENT
Electric current is the number of electrons that flow through the cross-section of a conductor every second. We can express this mathematically as follows:
                                        I=Q/t
I=electric current
Q=coulomb
t=time (s)
Electric current is measures in amps (A) in the S.I.

If we want to measure the electric current we use an ammeter, and it must be connected in series.

               
Resultado de imagen de ammeter              Resultado de imagen de ammeter


ELECTRICAL RESISTANCE: Ohm's Law
The resistance (R) of a material is equal to the voltage divided by the intensity of the electic current wich travels trough the material. This ratio, wich is called Ohm's Law, can be expressed as follows:
                                      R=V/I

Ohm's Law has two forms:
                                  V=RxI       I=V/R

The resistance is measured in omh (Ω)





ELECTRICAL ENERGY AND POWER
ELECTRICAL ENERGY
If an electric current (I) flows at a particular tension (V) for a certain amount of time (t) we can calculate the energy (E) that is consumed: E= VxIxt 
The energy is measured in joules (J)

Resultado de imagen de electrical energy




ELECTRIC POWER
Electrical power is the energy consumed over a certain amount of time. It is measured in watts (W) or kilowatts (kW)

If an electric current (I) flows at a particular tension (V) we can calculate the power that is consumed:
                                        P=VxI


Resultado de imagen de electrical power

You can click here and you will learn more about power 








 

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