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!!!