Current Electricity – Hub of related Posts

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Ammeters and Voltmeters – FAQs, connection, concepts

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?

The following tables describe some of the common components of electrical circuits, their functions, images, and the symbols that are used to represent them in circuit diagrams. Figure 1 Figure ...
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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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How do you derive the resistivity formula easily?

In this post we will cover How to derive resistivity formula through a simple experiment. It's basically deriving the resistivity formula with our understanding of electrical resistance. To do this ...
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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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