Contents
What are the three phenomena of electricity?
Direct Current — (old: Galvanic Current) or “continuous current”; The continuous flow of electricity through a conductor such as a wire from high to low potential. Electroluminescence — The phenomenon wherein a material emits light in response to an electric current passed through it, or to a strong electric field.
What phenomenon can occur if a person becomes part of an electric circuit?
An electric shock is the physiological reaction or injury caused by an electric current passing through the (human) body. It occurs upon contact of a body with two points (one of them can be the ground) that have two different electrical potential values.
What are the common phenomena associated with static electricity?
The phenomenon of static electricity requires a separation of positive and negative charges. When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other.
What does voltage mean physically?
electric potential energy
Voltage is a representation of the electric potential energy per unit charge. It is equal to the work that would have to be done per unit charge against the electric field to move the charge from one point to another. Voltage is a scalar quantity; it does not have direction.
What are the two types of electricity?
Current electricity is a constant flow of electrons. There are two kinds of current electricity: direct current (DC) and alternating current (AC).
Is electricity a natural phenomena?
Electricity is a natural phenomenon that occurs throughout nature and takes many different forms.
What happens when electricity passes through human body?
Electric current is able to create severe burns in the body. The reason is hidden in the power dissipation across the body´s electrical resistance. Shock can cause: cardiac arrest, burns to tissues and organs, muscle spasms, serious effects to the nervous system and other unexpected consequenses.
How do you describe voltage?
Voltage is the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light. In brief, voltage = pressure, and it is measured in volts (V).
What happens when DC current passes through a long straight conductor?
Electromagnetic Induction When a DC current passes through a long straight conductor a magnetising force and a static magnetic field is developed around it
What happens when conductor does not move at right angles to magnetic field?
If the conductor does not move at right angles (90°) to the magnetic field then the angle θ° will be added to the above expression giving a reduced output as the angle increases:
Which is the basic principle of electromagnetic induction?
Then by either moving the wire or changing the magnetic field we can induce a voltage and current within the coil and this process is known as Electromagnetic Induction and is the basic principle of operation of transformers, motors and generators.
What happens when the magnet is pulled away from the coil?
When the magnet stops moving and is held stationary with regards to the coil the needle of the galvanometer returns back to zero as there is no physical movement of the magnetic field.