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What is the unit of measurement for the intensity of current?
The resistance of a conductor depends on the material it is made of.
True
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 ______________________.
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Match the following electrical quantities with their units of measurement:
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The resistance of a conductor increases as the length of the conductor decreases.
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What is the purpose of resistances in a circuit?
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What is the formula to calculate the resistance of a conductor?
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What is the direction of the electric current in a conductor?
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The intensity of electric current is the amount of voltage applied to a conductor.
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What is the frequency of the alternating electric current in a conductor?
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The electric current was discovered by _______________ when he invented the battery.
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Match the following types of electric current with their characteristics:
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What is the main application of direct current (DC)?
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The polarity of direct current (DC) is constantly changing.
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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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Description
This quiz is about the concept of electrical current, comparing it to the flow of water in a river. It explains how electrical charges can move due to a difference in electric potential, resulting in an ordered and permanent flow of electrons through a conductive material.
