Physics Electromotive Force and Ohm's Law Quiz

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Questions and Answers

What is the definition of electromotive force (emf) and what role does it play in an electrical circuit?

Electromotive force (emf) is the energy provided per unit charge by a battery or generator. It drives the flow of current through a circuit.

Describe what electrical current is and how it is measured.

Electrical current is the flow of electric charge, typically measured in amperes (A). It represents the rate at which charge is flowing through a conductor.

Explain what potential difference is and how it relates to current in a circuit.

Potential difference, or voltage, is the difference in electric potential between two points in a circuit that drives current flow. It is directly related to the amount of work done to move a charge.

What does Ohm's law state and how is it mathematically expressed?

<p>Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points. It is mathematically expressed as $V = IR$, where $V$ is voltage, $I$ is current, and $R$ is resistance.</p> Signup and view all the answers

How do emf, potential difference, and resistance interrelate according to Ohm's law?

<p>According to Ohm's law, the potential difference (voltage) across a resistance is equal to the electromotive force (emf) minus the voltage drop across the resistance, which determines the current flow. Mathematically, it can be stated as $V = EMF - I imes R$.</p> Signup and view all the answers

Flashcards

What is EMF?

Electromagnetic force (EMF) is the force that exists between electrically charged objects. It's one of the fundamental forces of nature, and it's what makes electricity possible.

What is electric current?

Electric current is the flow of electric charge. It's usually measured in amperes (A) and represents the rate at which charge flows through a conductor.

What is potential difference?

Potential difference, also called voltage, is the difference in electric potential between two points in a circuit. It's the driving force that pushes electric current through a circuit.

What is Ohm's Law?

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. The constant of proportionality is the resistance.

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Explain resistance.

Resistance is the opposition to the flow of electric current. It's measured in ohms (Ω) and is determined by factors like the material, length, and cross-sectional area of a conductor.

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