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Questions and Answers
What is the primary difference between series and parallel circuits in terms of voltage?
What is the primary difference between series and parallel circuits in terms of voltage?
What is the formula to find the electric current (I)?
What is the formula to find the electric current (I)?
What is the purpose of an ammeter?
What is the purpose of an ammeter?
What is the direction of flow of Alternating Current (AC)?
What is the direction of flow of Alternating Current (AC)?
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What is the unit of electric current?
What is the unit of electric current?
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What is the symbol for electric current?
What is the symbol for electric current?
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What is the type of quantity that electric current is?
What is the type of quantity that electric current is?
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What is the formula to find the time it takes for the charges to flow?
What is the formula to find the time it takes for the charges to flow?
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What is the purpose of creating a table of values for combination circuits?
What is the purpose of creating a table of values for combination circuits?
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What is the unit of charge?
What is the unit of charge?
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Study Notes
Ohm's Law
- Ohm's Law states that the resistance remains constant over a wide range of applied voltages or currents.
- Materials that obey Ohm's Law are said to be ohmic.
- The formula for Ohm's Law is: V = IR, where V is voltage, I is electric current, and R is resistance.
- Georg Simon Ohm formulated the concept of resistance and discovered the proportionality between voltage and current.
Electric Current
- Electric current is the rate at which charges flow through a surface.
- The symbol for electric current is I, and its SI unit is Ampere (A).
- Electric current is a scalar quantity.
- The formula for electric current is: I = Q/t, where I is electric current, Q is charge, and t is time.
Resistance
- Resistance is a property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.
- The symbol for resistance is R, and its SI unit is Ohm (Ω).
- Resistance is a scalar quantity.
- Resistance is always present in an electric circuit.
Series and Parallel Circuits
- In a series circuit, resistors are connected end-to-end.
- In a series circuit, the voltage is different for each resistor.
- In a parallel circuit, resistors are connected between the same two points.
- In a parallel circuit, the voltage is the same for each resistor.
Current Flow
- Conventional flow is the flow of current from a positive terminal to a negative terminal of a source.
- Electron flow is the flow of current from a negative terminal to a positive terminal of a source.
- Electron flow is present in every metal.
Measuring Current
- An ammeter is used to measure current.
- The formula for calculating the number of electrons flowing through a circuit is: Number of electrons = Q/e, where Q is the charge and e is the elementary charge.
Direct Current (DC) vs Alternating Current (AC)
- Direct Current (DC) flows in one direction.
- Alternating Current (AC) flows first in one direction and then the other.
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Description
Test your understanding of Ohm's Law and its application to various materials, including metals. Learn how to calculate voltage, current, and resistance using the formula V = IR.
