Effect of Temperature on Resistance
Temperature dependence of resistance:
When temperature increases, the no. of collisions increases due to more internal energy and relaxation time decreases. Therefore, Resistance increases.
Temperature Coefficient...
Color Code for Carbon Resistor
The first two bands from the end indicate the first two significant figures of the resistance in ohms.
The third band indicates the decimal multiplier.
The...
Ohm’s Law
The electric current I flowing through a substance is proportional to the voltage V across its ends, i.e.,
V ∝ I
V = RI,
where R...
Mobility
As we have seen, conductivity arises from mobile charge carriers. In metals, these mobile charge carriers are electrons; in an ionized gas, they are...
Drift Velocity
The average velocity gained by the free electrons of a conductor in the opposite direction of the externally applied electric field is called Drift...
Electric Current
The flow of electric charges through a conductor constitutes an electric current. Quantitatively, the electric current in a conductor across an area held perpendicular...
Energy stored in a Capacitor
Energy stored in a capacitor
The energy U stored in a capacitor of capacitance C, with charge Q and voltage V is
The electric energy density...
Capacitance of a Parallel Plate Capacitor
Capacitance of a parallel plate capacitor
A parallel plate capacitor consists of two large plane parallel conducting plates separated by a...
Combination of Capacitors in Series and in Parallel
Capacitors in series:
Fig.a shows capacitors C1 and C2 combined in series.
Fig.a. Combination of two capacitors in series
...
Capacitors and Capacitance
Capacitors
A capacitor (formerly known as condenser) is a device that can store electronic charge and energy.
All...