Physics Tutor in Umm Al Quwain City

+91-9958461445

If you live in Umm Al Quwain City and Physics is becoming difficult for you, then you are not alone. Many students attend school regularly, complete homework, read notes, but still feel confused when numerical questions, derivations and application-based problems come in exams. Physics is not a subject of memorising lines; it needs concept clarity, formula understanding, diagram practice and regular problem-solving.

At Kumar Physics Classes, Kumar Sir teaches Physics from the basic level. First, he explains the physical meaning of the concept, then the formula, then derivation, and finally numerical application. This method is very useful for CBSE Physics, ICSE Physics, IGCSE Physics, IB Physics, AP Physics, A-Level Physics, NEET Physics and IIT JEE Physics.

Students living in Umm Al Quwain City who are preparing for school exams, board exams, medical entrance, engineering entrance or international curriculum Physics can contact Kumar Sir for online Physics classes.

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Why Students Need a Good Physics Tutor in Umm Al Quwain City

Many students say, “I understand in class, but I cannot solve questions.” This happens because Physics requires step-by-step training. In topics like Electricity, Magnetism, EMI, AC, Optics, Mechanics, Waves, Modern Physics and Thermodynamics, students must understand the concept behind every formula.

Kumar Sir focuses on:

Concept clarity
Formula derivation
Diagram-based learning
Numerical practice
Board exam writing style
NEET and IIT JEE problem-solving
AP, IB, A-Level and IGCSE pattern questions
Regular doubt solving

Courses Taught by Kumar Sir

Physics Tutor in Umm Al Quwain City for IIT JEE, Physics Tutor in Umm Al Quwain City for NEET, Physics Tutor in Umm Al Quwain City for AP Physics, Physics Tutor in Umm Al Quwain City for A-Level Physics, Physics Tutor in Umm Al Quwain City for IB Physics, Physics Tutor in Umm Al Quwain City for CBSE Physics, Physics Tutor in Umm Al Quwain City for IGCSE Physics

Contact Kumar Physics Classes

Call / WhatsApp: +91-9958461445
Website: kumarphysicsclasses.com
Email: kumarsirphysics@gmail.com

नीचे वाला text website पर आसानी से copy-paste होगा:

Current Electricity: Important Definitions and Concepts

1. EMF of a Cell

EMF is the potential difference between the two terminals of a cell when no current is drawn from the cell.

Open circuit terminal potential difference = EMF

Formula: E = V

when current is zero.

2. Terminal Potential Difference

When current is drawn from the cell, terminal potential difference becomes:

Formula: V = E – Ir

where r is internal resistance.

3. Drift Velocity

Drift velocity is the average velocity with which free electrons move inside a conductor under electric field.

Formula: vd = eEτ / m

4. Relaxation Time

Relaxation time is the average time between two successive collisions of free electrons.

5. Resistivity

Resistivity is the resistance of a material of unit length and unit area.

Formula: R = ρl / A

6. Conductivity

Conductivity is the reciprocal of resistivity.

Formula: σ = 1 / ρ

7. Microscopic Ohm’s Law

Current density is directly proportional to electric field.

Formula: J = σE

8. Ohm’s Law

At constant temperature, current through a conductor is directly proportional to potential difference.

Formula: V = IR

9. Temperature Dependence of Resistance

For metals:

Formula: RT = R0(1 + αT)

When temperature increases, resistance of metals increases.

10. Effect of Temperature

Material	Effect of Temperature
Metal conductor	Resistance increases
Insulator	Resistance decreases slightly at high temperature
Semiconductor	Resistance decreases strongly
Alloy	Resistance changes very little

11. Wheatstone Bridge Principle

Wheatstone bridge is balanced when no current flows through galvanometer.

Formula: P / Q = R / S

12. Linear Element

A linear element obeys Ohm’s law. Its V-I graph is a straight line.

Example: metallic resistor at constant temperature.

13. Non-Linear Element

A non-linear element does not obey Ohm’s law. Its V-I graph is not a straight line.

Examples: diode, transistor, filament bulb.

40 Conceptual Questions with Answers

What is an open circuit?
An open circuit is a circuit in which the path of current is broken.
Does current flow in an open circuit?
No, current does not flow.
What is voltage in an open circuit?
Voltage may exist, but current is zero.
What is a closed circuit?
A closed circuit is a complete circuit path in which current can flow.
Does current flow in a closed circuit?
Yes, current flows.
What is the main difference between open and closed circuit?
Open circuit has broken path; closed circuit has complete path.
What is a diode?
A diode is a semiconductor device that allows current mainly in one direction.
What is forward bias?
When p-side is connected to positive terminal and n-side to negative terminal.
What is reverse bias?
When p-side is connected to negative terminal and n-side to positive terminal.
Does diode obey Ohm’s law?
No, diode is a non-ohmic device.
Why is diode called non-linear?
Because its V-I graph is not a straight line.
What is resistance?
Resistance is the opposition offered by a conductor to current.
Formula of resistance?
Formula: R = V / I
SI unit of resistance?
Ohm.
What is resistivity?
Resistivity is the resistance of material of unit length and unit area.
Formula of resistivity?
Formula: ρ = RA / l
SI unit of resistivity?
Ohm metre.
Does resistance depend on length?
Yes, resistance is directly proportional to length.
What happens when length increases?
Resistance increases.
Does resistance depend on area?
Yes, resistance is inversely proportional to area.
What happens when area increases?
Resistance decreases.
What is an alloy?
An alloy is a mixture of two or more metals or a metal with non-metal.
Why are alloys used in resistance wires?
Because they have high resistivity and low temperature coefficient.
Examples of alloys used in resistance wires?
Manganin, constantan and nichrome.
Why is nichrome used in heaters?
Because it has high resistivity and high melting point.
Why is manganin used in metre bridge?
Because its resistance changes very little with temperature.
What happens to resistance of metals when temperature increases?
Resistance increases.
What happens to resistance of semiconductors when temperature increases?
Resistance decreases.
What happens to resistance of insulators at high temperature?
Resistance decreases slightly.
What is conductivity?
Conductivity is reciprocal of resistivity.
Formula of conductivity?
Formula: σ = 1 / ρ
SI unit of conductivity?
Siemens per metre.
What is an ohmic conductor?
A conductor that obeys Ohm’s law.
Example of ohmic conductor?
Metallic wire at constant temperature.
What is a non-ohmic conductor?
A device that does not obey Ohm’s law.
Example of non-ohmic device?
Diode.
Why does resistance oppose current?
Because moving electrons collide with ions of the conductor.
What is open circuit resistance ideally?
Ideally infinite resistance.
What is closed circuit resistance ideally?
It has finite resistance depending on components.
Why is resistivity better than resistance for comparing materials?
Because resistivity depends only on material, not on length or area.