Current Electricity – Hub of related Posts

Here goes the list of our posts on Current Electricity and related topics and subtopics.

emf and internal resistance questions – numerical

In this post, we will solve numerical questions or problems related to the emf of a cell and internal resistance. We will also use the concepts of terminal potential difference, ...
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Seebeck effect

In this post, we will discuss the Seebeck effect or thermoelectric effect and other related points like thermocouple, thermoelectric emf, thermoelectric series, variation in thermoelectric emf with temperature, Neutral and ...
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Applications of the heating effect of current | applications of Joule heating

In this post, we will discuss some applications of the heating effect of current (applications of Joule heating). Applications of the heating effect of current Here are some examples of ...
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Heating effect of electric current Joule’s law

In a conductor, due to thermal agitation, the free electrons are always at random motion making collisions with ions or atoms of the conductor. When a voltage V is applied ...
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Temperature coefficient of resistance – formula

The temperature dependence of resistance of a conductor can be expressed with the formula R2 = R1 ( 1 + α t), where α is the temperature coefficient of resistance ...
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Temperature dependence of resistivity

The variation of resistivity of a metallic conductor, an alloy, a semiconductor, or an insulator with an increase in temperature is not the same in all cases. Temperature dependence of ...
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j = sigma e derivation for the Vector form of Ohm’s law

In this post, we will derive the equation j = sigma e and we will do the derivation using Ohm's law equation (V=IR). Obtaining this equation vec J = σ ...
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Dimension of Resistance | electric Resistance dimension

Resistance R of the conductor is the ratio of the potential difference to the current. R =V/I. Now, let's find out the dimension of resistance. (Dimensional formula) Dimension of resistance ...
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Resistivity or specific resistance (ρ)

Resistivity or specific resistance - While deriving Ohm's Law with the help of drift velocity equations, we got the expression or formula of resistance as follows: R = [(mL)/(ne2τA)]. Here, ...
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Derivation of Ohm’s Law class 12 (using drift velocity equations)

Derivation of Ohm's Law class 12 - Here, in this post, we will derive Ohm's Law using drift velocity equations following the class 12 syllabus. Know more about the fundamentals ...
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Drift velocity and mobility of an electron

In this post, we will see how the drift velocity of an electron is related to its mobility. The drift velocity of an electron can be expressed as vd = ...
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Drift velocity formula derivation

In this post, we will derive the drift velocity formula and understand the concepts of the drift velocity of an electron. Drift velocity formula derivation | derive drift velocity equation ...
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Drift velocity formula

In this post, we will present the drift velocity formula or equation in terms of different variables like the mobility of an electron, electric current, current density, relaxation time, electric ...
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Electric current & shock

This post is a compilation of a set questions with answers related to electric current flow and electric shock. What levels of current are dangerous? Approximately 1 mA (0.001 A) ...
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How to use the PIV Triangle for the Electrical Power formula

The power formula expresses fundamental relationships among power, current, and voltage. On occasion, you may be asked to calculate any one of the three variables in this equation, given the ...
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How to use the VIR Triangle for Ohm’s Law?

Ohm’s Law expresses fundamental relationships among voltage, current, and resistance. On occasion, you may be asked to calculate any one of the three variables in this equation, given the other ...
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Resistance of metal increases with an increase in temperature – how?

When current flows through the material of a circuit, such as the metal of the connecting wires, the material of the circuit gets in the way of the flow of ...
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AQA GCSE Physics – Equations & Formulae from Electricity chapter

The image below shows a list of equations and formulae from the chapter "Electricity" of the GCSE Physics syllabus. This is also helpful for all other equivalent boards like CBSE, ...
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Resistivity and Conductivity Solved numerical problems (Worked Solutions)

In this post, we have compiled a bunch of interesting numerical problems on Resistivity and Conductivity. These are Solved numerical problems (Worked Solutions). Resistivity and Conductivity numerical problems (solved worksheet) ...
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Kirchhoff’s Voltage law, KVL – statement, formula, example, sign convention

In this post, we will discuss Kirchhoff’s second law, or Kirchhoff's Voltage Law (also known as KVL, Kirchoff's Loop Rule, or Kirchoff's Loop law) with an example or case study ...
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Heating effect of electric current class 10 – formulas & Numerical

In this post, we will discuss the Heating effect of electric current (class 10) and list down the Heating Effect formulas or Equations of electric power and energy. And, then ...
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Measuring the resistance of a component – different ways

In this post, we are going to discuss different ways of measuring the resistance of a component. Resistance is defined as R = V/I. This obviously gives ways of measuring ...
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Numerical problems on Resistivity with solution

This post presents a few important numerical problems in physics that you can solve using the concepts of resistivity. If you want a quick revision to memorize the resistivity formula ...
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AC Waveforms of different types

Alternating Current,(AC) is a current that changes direction cyclically, passing first in one direction, then in the other through a circuit. Such alternating currents are produced by generators and other ...
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Conductors & Insulators with examples & How do they differ?

In some materials, electrons move easily from atom to atom. In others, the electrons move with difficulty. And in some materials, it is almost impossible to get them to move ...
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Conservation of Charge & Energy in electrical Circuits

In this post, we will have some pointers on the Conservation of Charge & Energy in electrical Circuits. Charge Doesn’t ‘Leak Away’ Anywhere — it’s Conserved in electrical circuits. Energy ...
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Ammeters and Voltmeters

Ammeters measure the current of a circuit, and voltmeters measure the voltage drop across a resistor. Ammeters and voltmeters are cleverly designed because it is important in the design to ...
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Kirchhoff’s first law | Kirchhoff’s Current Law (KCL) – Explained & derived

Gustav Kirchhoff, an eminent German physicist is the person behind Kirchhoff’s first law dealing with electric current. This law is also known as Kirchhoff’s Current Law or KCL. The KCL ...
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Numerical problems on Drift velocity of electrons and electric current-how to solve?

The numerical problems in this post are based on the drift velocity of electrons and electric current. Electric Current is expressed as I = nAve ( see the derivation of ...
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What is the Internal Resistance of cells?

What is the Internal Resistance of cells & how it affects the current flow in a circuit? All electric cells are made of materials that have resistance. The resistance of ...
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How Small drift speed of electron causes high-speed electric current?

Most charge carriers, like electrons, move slowly. Free electrons repeatedly collide with the positive metal ions as they drift through the wire towards the positive terminal. The reason that electric ...
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How to Derive the relationship between Current and drift velocity

Here we will derive the equation showing the relationship between current and drift velocity. The drift velocity is the average velocity of the free charges and it is in the ...
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The resistivity of different materials – shown in a table

The objective of this post is to present the resistivity of different materials in a table. Let's do that first. The resistivity of different materials showed in a table at ...
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Symbols & functions of Common components of electrical circuits – How to get?

Figure 1 below presents 17 circuit symbols for a variety of circuit components like cell, battery, switch open, switch closed, ammeter, voltmeter, motor, resistor, thermistor, fuse, diode, LED (Light Emitting ...
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Voltages in series circuits and parallel circuits – easy understanding

Voltages in series circuits and parallel circuits - Let's see how total voltage in series circuits and parallel circuits are calculated. Voltages in series circuits A series circuit has no ...
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How current flows through series and parallel circuits? A quick reference

Here we will see how current flows through series and parallel circuits. Currents in series circuits In a series circuit, devices are connected so there is only one closed path ...
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Relation between resistance and resistivity through a simple experiment

In this post, we will cover How to find the Relation between resistance and resistivity through a simple experiment. It's basically deriving the resistivity formula with our understanding of electrical ...
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How to identify I-V graph of a Thermistor & I-V graph of a filament bulb?

I-V graph of a Thermistor and I-V graph of a filament bulb are not identical. Now the question is: How to identify the I-V graph of a Thermistor and the ...
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Equivalent resistance of a parallel circuit with derivation & numerical problems

The equivalent resistance of a parallel circuit is found using Kirchoff's junction rule, which states that the sum of the currents entering a branch (or junction) must be equal to ...
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Series Circuits, Resistors in series & equivalent resistance – numerical

What is a series circuit? A series circuit consists of several resistors connected in sequence, one after the other. This increases the length of the conductor. Therefore total resistance increases ...
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Direction of the Current | Conventional & Electronic

The direction of the current: We will discuss this to find out answers to two related questions here. These questions are (1) What is the direction of conventional current? (2) ...
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Electric Current – Definition, formula & unit

If two charged bodies are connected by a metallic wire, electrons start flowing from the body having more electrons (negatively charged body), to the body with less electrons (positively charged ...
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Ohm’s Law Problems in Physics – CBSE, ICSE Class 9 and 10

Ohm's Law Problems in physics: The numerical problems from Ohm's law topic are apt for class 9 physics and class 10 physics courses offered by boards like CBSE, ICSE. Here ...
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Ohm’s law statement with formula & VI Graph | derivation

figure 1: I-V characteristic of a metallic conductor (Ohmic) Ohm’s Law states: The potential drop across a resistor is proportional to the current passing through the resistor: V ∝ I ...
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