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Questions and Answers
What is the unit of measurement for the intensity of current?
What is the unit of measurement for the intensity of current?
- Coulombs
- Voltios
- Amperes (correct)
- Joules
The resistance of a conductor depends on the material it is made of.
The resistance of a conductor depends on the material it is made of.
True (A)
What is the relationship between the intensity of current and the difference of potential in a conductor?
What is the relationship between the intensity of current and the difference of potential in a conductor?
The intensity of current is directly proportional to the difference of potential.
The energy that a generator cedes to a circuit to move a coulomb of electric charge is measured in ______________________.
The energy that a generator cedes to a circuit to move a coulomb of electric charge is measured in ______________________.
Match the following electrical quantities with their units of measurement:
Match the following electrical quantities with their units of measurement:
The resistance of a conductor increases as the length of the conductor decreases.
The resistance of a conductor increases as the length of the conductor decreases.
What is the purpose of resistances in a circuit?
What is the purpose of resistances in a circuit?
What is the formula to calculate the resistance of a conductor?
What is the formula to calculate the resistance of a conductor?
What is the direction of the electric current in a conductor?
What is the direction of the electric current in a conductor?
The intensity of electric current is the amount of voltage applied to a conductor.
The intensity of electric current is the amount of voltage applied to a conductor.
What is the frequency of the alternating electric current in a conductor?
What is the frequency of the alternating electric current in a conductor?
The electric current was discovered by _______________ when he invented the battery.
The electric current was discovered by _______________ when he invented the battery.
Match the following types of electric current with their characteristics:
Match the following types of electric current with their characteristics:
What is the main application of direct current (DC)?
What is the main application of direct current (DC)?
The polarity of direct current (DC) is constantly changing.
The polarity of direct current (DC) is constantly changing.
What is the magnitude of electric current that represents the amount of charge that passes through a cross-sectional area of a conductor in a unit of time?
What is the magnitude of electric current that represents the amount of charge that passes through a cross-sectional area of a conductor in a unit of time?
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Study Notes
Electric Current
- Electric current is the ordered and permanent movement of electrons through a conductive material, due to a difference in electric potential between the ends of the material.
- The direction of electric current in a conductor is from the negative pole to the positive pole, although it is historically considered in the opposite direction.
Types of Electric Current
- Direct Current (DC): a continuous flow of electrons through a conductor between two points of different voltage, with a constant polarity.
- Alternating Current (AC): a vibration of electrons in a conductor, producing a wave-like transmission of electricity, with a changing polarity.
- AC is used in generators, such as batteries, and is more efficient for large-scale energy transmission.
Magnitudes of Electric Current
- Intensity of Current: the amount of charge that crosses a conductor's cross-section in a unit of time, measuring the velocity of electrons or charges.
- Potential Difference: the difference in electric potential between two points, affecting the energy gained by electrons.
- Resistance: a measure of a material's opposition to the flow of electric current, dependent on factors such as length, cross-section, and resistivity.
Resistance
- Resistivity: a characteristic of a material, dependent on temperature, with metals having low resistivity and insulators having high resistivity.
- Ohm's Law: the relationship between potential difference, intensity of current, and resistance, where intensity is directly proportional to potential difference and inversely proportional to resistance.
Calculations
- Energy: the total energy generated by a generator or consumed by a receptor, dependent on the product of potential difference and intensity of current.
- Power: the rate of energy transfer, calculated by the product of potential difference and intensity of current.
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