PHYSICS
CH-8
ELECTRICITY
1. Current:
Current is the flow of charge.
2. Ampere:
We define one ampere as the current which flows
through a conductor when one coulomb of charge passes
through it in one second.
3. 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.
4. Volt:
the Potential at a point is said to be 1 volt when 1 joule
of work is done in bringing 1 coulomb charge from infinity to
that point.
5. Potential difference:
The Potential difference Between two points
is equal to the work done per unit charge in moving a positive
test charge from one point to other point.
, 6. Resistance:
The obstruction offered to the flow of current by
the conductor (or wire) is called the resistance.
7. Ohm’s Law:
According to Ohm’s law, all physical condition of a
conductor remaining same, the current flowing in a
conductor is directly proportional to the Potential difference
across its end.
8. Ohm:
The resistance of a conductor is said to be 1 ohm if 1
ampere current flows through it when a potential difference
of 1 volt is applied across the ends of the conductor.
9. Conductance:
The reciprocal of resistance is called conductance.
10. Ohmic resistor: (Linear resistance)
The conductors which obey ohms law.
Ex: all metallic conductors (Silver, cu, Fe, etc)
11. Non-ohmic resistor: (non- linear resistance)
The conductors which do not obey ohms
law. Ex: LED, solar cell, junction diode etc.
12. Specific resistance: (Resistivity)
Specific resistance of a material is the
resistance of a wire of that material of unit length and unit
area of cross section.
13. Conductivity:
The reciprocal of specific resistance.
CH-8
ELECTRICITY
1. Current:
Current is the flow of charge.
2. Ampere:
We define one ampere as the current which flows
through a conductor when one coulomb of charge passes
through it in one second.
3. 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.
4. Volt:
the Potential at a point is said to be 1 volt when 1 joule
of work is done in bringing 1 coulomb charge from infinity to
that point.
5. Potential difference:
The Potential difference Between two points
is equal to the work done per unit charge in moving a positive
test charge from one point to other point.
, 6. Resistance:
The obstruction offered to the flow of current by
the conductor (or wire) is called the resistance.
7. Ohm’s Law:
According to Ohm’s law, all physical condition of a
conductor remaining same, the current flowing in a
conductor is directly proportional to the Potential difference
across its end.
8. Ohm:
The resistance of a conductor is said to be 1 ohm if 1
ampere current flows through it when a potential difference
of 1 volt is applied across the ends of the conductor.
9. Conductance:
The reciprocal of resistance is called conductance.
10. Ohmic resistor: (Linear resistance)
The conductors which obey ohms law.
Ex: all metallic conductors (Silver, cu, Fe, etc)
11. Non-ohmic resistor: (non- linear resistance)
The conductors which do not obey ohms
law. Ex: LED, solar cell, junction diode etc.
12. Specific resistance: (Resistivity)
Specific resistance of a material is the
resistance of a wire of that material of unit length and unit
area of cross section.
13. Conductivity:
The reciprocal of specific resistance.
