Electric Current

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Electrodinámica: parte 1

Bloque 3 / Semana 14

✔ Conocer y demostrar la ley de Ohm y la relación con la resistencia eléctrica.

✔ Revisión analítica y conceptual de la ley de Joule y su relación con el campo eléctrico.

✔ Resolución de problemas.

Objetivo

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Electrodinámica

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★

Subtemas

★

Potencial eléctrico.

★

Energía potencial.

★

Corriente eléctrica.

★

Resistencia.

★

Ley de Ohm.

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Electric current

Warmup​

• Write a paragraph about the importance of the use of electrical current in your life

• Make a list of 6 things that you consider using electrical current

Electrodynamics

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Applications

Electromagnetic Devices: electric motors,
generators, transformers

Electronic Devices: computers, cell phones,
televisions

Image: Picture of a real-life application of electric
current such as a power plant

Note: The images can be simple illustrations or
real-life photos that help visually represent the
concept being discussed on that slide.

Electrodynamics

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Types of Electric Current

Direct Current (DC): flow of electric charge in a
single, constant direction.

Alternating Current (AC): flow of electric charge
that periodically reverses direction.

Image: Picture showing the difference between DC
and AC

Electrodynamics

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Electric current

Definition of Electric Current: The flow of electric
charge in a conductor is known as electric current.

Formula:I = ΔQ/Δt

Unit:Ampere (A)

Image: Picture of electric current flowing through a
wire

Multiple Choice

Unit of the international system for measuring electric current

• Ampere (A)

• Coulomb (C)

• Volt (V)

• Watt (W)

Multiple Choice

Mathematical equation to calculate the current intensity

• I = q / t

• I = q * t

• I = t / q

• I = t * q

Multiple Select

Identify the types of electrical current that exist.

• Direct Current (DC)

• Intermittent Current (IC)

• Alternating Current (AC)

• Flowing Current (FC)

Electrodynamics

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Example

Determine the intensity of the electric current in a conductor when 75 coulombs flow through a section of it in 0.5 h. Give the result in amperes and in milliamps.

Sol.

I = ? ; q = 75 C ; t = 0.5 h (3600 s / 1h ) = 1800 s

Formula

I = q / t

Sust.

I = 75 C / 1800 s = 0.042 A

I = 42 mA

Electrodynamics

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Electric Current

1.

Calculate the intensity of the electric current in amperes and in milliamperes, if for a section of a cable circulates 65 coulombs in 30 minutes.

2.

Calculate the time required for 5 coulombs to flow through a section of a conductor; The intensity of the electric current is 5mA.

Electrodynamics

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Electric Current and Voltage

Definition: The relationship between electric current
and voltage is described by Ohm's Law: V = IR,

where V is the voltage, I is the current, and R is the
resistance of the conductor.

Image: Picture of a circuit with a battery, a wire, and
a resistor

Electrodynamics

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Resistance Electric

Definition of Electric Resistance: The opposition
offered by a material to the flow of electric current is
known as electric resistance.

Formula:R = V/I

Unit:Ohm (Ω)

Image: Picture of a resistor symbol.

Electrodynamics

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Factors affecting Electric Resistance

Material of the conductor: resistivity, temperature

Length of the conductor: longer conductors have
higher resistance

Cross-sectional area of the conductor: wider
conductors have lower resistance

Image: Picture showing the relationship between
resistivity, length, and cross-sectional area of a
conductor

Electrodynamics

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Ohm's Law

Definition: Ohm's Law states that the current
through a conductor between two points is directly
proportional to the voltage across the two points, and
inversely proportional to the resistance between
them.

Formula:V = IR

Image: Picture of a circuit with a battery, a wire, and
a resistor

Electrodynamics

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Applications

Electrical Devices: resistors, potentiometers,
rheostats

Circuit Analysis: determining current, voltage, and
power in a circuit

Image: Picture of a real-life application of electric
resistance such as a circuit board

Note: The images can be simple illustrations or
real-life photos that help visually represent the
concept being discussed on that slide.

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Actualización: 20 de julio de 2022