ELECTRICITY

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49 Terms

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Electrostatics
The study of stationary electric charges.
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Electrodynamics
The study of electric charges in motion.
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Electrification
can be created by contact, friction, or induction.
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negative electric charge
Electrification is due to the movement of
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electron
The smallest unit of electric charge is the
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coulomb (C)
The fundamental unit of electric charge is
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6\.3x10^18
1 C =
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1\.6x10^-19 C/electron charge
What is the electrostatic charge of one electron?
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Unlike charges attract; like charges repel.
Electrostatic Laws
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Coulomb’s Law
The electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them.
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Coulomb’s Law Formula
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Electric potential
is sometimes called voltage.
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volt (V)
The unit of electric potential is the
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Electric Current
• Flow of electrons in a conductor.

• Measured in amperes (A)
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ampere
is proportional to the number of electrons flowing in the electric circuit.
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One ampere
is equal to an electric charge of 1 C flowing through a conductor each second.
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DC and AC
2 Types of Current
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DC
- Electrons flowing only in one direction
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AC
Electrons flowing alternately in opposite directions.
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Electric Resistance
is measured in ohms (Ω)
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Resistor
is a passive two terminal electrical component that implements electrical resistance as a circuit element.
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electronics circuits
, resistors often used to limit current flow, to adjust signal levels, bias active elements, and terminate transmission lines among other uses.
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Conductors
is any substance through which electrons flows easily.
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Copper (Cu),

Aluminum (Al),

water
Conductors (3 examples)
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Insulators
is any material that does not allow electron flow
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Glass,

clay other earthlike material,

rubber
Insulators (3 examples)
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semiconductor
is a material that under some conditions behave as an insulator and in other conditions behaves as a conductor.
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William Shockley
demonstrated semiconduction
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1946
William Shockley demonstrated semiconduction
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Silicon (Si), germanium (Ge)
Semiconductors (2 examples)
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Superconductivity
is the property of some materials to exhibit no resistance below a critical temperature (Tc).
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1911
When were superconductors discovered?
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1960s
When were superconductors commercially available in
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Electric Circuits
When the resistance is controlled and the conductor is made into a closed path, the result is an electric current.
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Ohm’s Law
The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance.
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series circuit
All circuit elements are connected in a line along the same conductor.
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parallel circuit
Contains elements that are connected at their ends rather than lie in a line along a conductor.
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1. The total resistance is equal to the sum of the individual resistances.
2. The current through each circuit elements is the same and is equal to the total circuit current.
3. The sum of the voltages across each circuit element is equal to the total circuit voltage.
Rules for Series Circuits
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1. The sum of the currents through each circuit element is equal to the total circuit current.
2. The voltage across each circuit element is the same and is equal to the total circuit voltage.
3. The total resistance is the inverse of the sum of the reciprocals of each individual resistance.
Rules for Parallel Circuits
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Electric Power
is measured in watts (W)
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Electrical Fault
Is an electric power system, a fault or fault current is any abnormal electric current
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ground fault (earth fault)
is any failure that allows unintended connection of power circuit conductors with the earth.
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Electrical grounding
provides an alternate path for electricity to follow, rather than going through a person.
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Electric Shock
happens when current passes through the body.
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Electrocution
Refers to the injury or lethal dose of electrical energy
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Electrical fires
may be caused by excessive resistance that generates heat
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• Too much current running through wiring where overcurrent protection fails or does not exist • Faulty electrical outlets resulting in poor contact or arcing • Poor wiring connections and old wiring that is damaged and cannot support the load
Causes of Electrical fires
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explosion
can occur when electricity ignites a flammable gas or combustible dust mixture in the air.
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circuit breaker
is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.