2. ELECTRICAL QUANTITIES

2.1. 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).
This device has two wires that must be connected in parallel to the element that we are checking.

2.2. Measuring electric current.
Electric current is the charge or number of electrons that flo through the cross-section of a conductor every second.
                                                                  I= Q/t 
Electric current is measured in amperes or amps (A).

2.3. Electric resistance: Ohm's Law.
 The resistance (R) of a material is equal to the voltage divided by the intensity of the electric current which travels through the material. This ratio, which is called Ohm's Law, can be expressed as follows:
                                                                              R= V/I
Ohm's Law has two forms:
 V = R x I    and   I = V/R

2.4. Electric energy and power.

Electrical energy.
If an electric current flows at a particular tension for a certain amount of time, we can calculate the energy that is consumed:   E = Vx I x t
Is measured in joules (J).

Electrical power.
The electrical power of a load is the amount of energy that it can transform over a certain amount of time. Electric power is measured in watts (W) or kilowatts (kW).

If an electrical current flows at a particular tension, we can calculate the power (P) that is consumed:
                                                                        P = V x I
We simply multiply the power in kiloatts by the amount of time in hours.
                                                                        E = P x t