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)

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

      



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.

               
              


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)

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

You can click here and you will learn more about power