10 Questions
What is charge in physics?
A physical property of matter causing it to experience a force in an electromagnetic field
What is potential difference (V) defined as?
The work done in carrying a unit positive charge form one point to another
What establishes a unidirectional electric field in an electrical circuit?
Putting a cell in the electrical circuit
Why do metals have a large number of free electrons?
Metals have a tendency to lose their outer shell electrons easily, contributing to free electrons
What does the word 'current' mean in 'electric current'?
'Flow'
Charge (q) is a physical property of matter that causes it to experience a force when placed in an electromagnetic field. Note charge is just a property, however, particles possessing this property, like, ______ are also some times termed as charge, this is technically incorrect as charge is not matter, and it is just a property.
electron, proton, ions
Potential Difference (V) equals the work done in carrying a ______ form one point to another. Also defined as work done per ______
unit positive charge
Electric Field (E) is a measure of the strength of ______ per unit charge at a given point. A unidirectional electric field gets established when we put a cell in an electrical circuit. It is the electric field that results in a flow of electric current in the circuit. Larger the Electric field, higher is the rate of flow of charge (current).
electric force
As you know metals are rich in ______, which are constantly in motion within the conductor. Why do metals have a large number of ______. From where do these ______ come from. The presence or otherwise, of ______ depends upon the nature of the materials. Metals have a tendency to lose their outer shell electrons easily. Their atoms, which contribute to ______, become ions. The word „current‟ means „flow‟ hence electric current means „flow of charge‟.
free electrons
The word „current‟ means „‟ hence electric current means „ of charge‟.
flow
Study Notes
Electric Charge and Electric Field
- Charge is a physical property of matter that causes it to experience a force when placed in an electromagnetic field.
- Charge is not matter, but rather a property of matter.
- Particles possessing charge, such as electrons, are sometimes termed as charge, but this is technically incorrect.
Potential Difference (V)
- Potential difference (V) equals the work done in carrying a unit charge from one point to another.
- It is also defined as work done per unit charge.
Electric Field (E)
- Electric Field (E) is a measure of the strength of force per unit charge at a given point.
- A unidirectional electric field is established when a cell is placed in an electrical circuit.
- The electric field results in a flow of electric current in the circuit, and a larger electric field leads to a higher rate of flow of charge (current).
Metals and Free Electrons
- Metals have a large number of free electrons due to their tendency to lose their outer shell electrons easily.
- These free electrons come from the atoms of the metal, which contribute to the flow of charge.
- The presence or otherwise of free electrons depends on the nature of the materials.
Electric Current
- The word "current" means "flow", hence electric current means "flow of charge".
Test your knowledge of electric charge and potential difference with this quiz. Explore the fundamental concepts of charge as a physical property and potential difference as the work done in carrying a unit positive charge from one point to another.
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