Part A Flashcards
State the unit of charge?
Coulomb
How the current is defined?
Current is defined as the rate of flow of charge
Formula for current?
I = Q/t
Define ampere
One ampere as the current which flow in a conductor when one coulomb of charge passes through it in one second
Current is a scalar or vector quantity?
Scalar
What is concept potential ?
The potential at a point is defined as the amount of work done per unit charge in bringing a positive test charge from infinity to that point
What is potential difference ?
The potential difference between two point is equal to the work done per unit charge in moving a positive test charge from one point to another
Define resistance?
The obstruction offered to the flow of current by the conductor is called it’s resistance
What is ohm’s law?
According to ohm’s law the current flowing in a conductor is directly proportional to the potential difference applied accross it’s end provided that the physical conditions and the temperature of the conductor remain constant
Factor affecting resistance of a conductor
Material, length , thickness and temperature of conductor
If the length of the conductor increase then the resistance will be
More
If the thickness of the conductor is more then the resistence will be
Less
Temperature of the conductor increases with
Increases in resistence
What is specific resistance
Specific resistance of a material Is the resistance of a wire of that material of unit length and unit area of cross section
What is super conductor
It is a substance of zero resistance at a very low temperature
