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Electromotive Force EMF - Definition, Unit, Circuit Diagram

2020-10-13T13:57:00.002+05:30

In this post you will learn about electromotive force vs voltage, electromotive force formula, electromotive force definition physics, electromotive force application

EMF is the short form of electromotive force.

All the metals contain a large number of free electrons which move randomly in all the directions, inside the metal piece, if no external source is connected.

If a battery or voltage source is connected across a metal piece as shown in Fig. then the free electrons will move in the direction of positive end of the external de source. This happens due to the electric force or pressure by the external battery.

Definition

The electrical force or pressure that causes the electrons to move in a particular direction is called as the electromotive force EMF

Unit

The units of e.m.f. is volts and e.m.f. is also called as voltage or potential difference. It is denoted by V or sometimes by E.

What is Electrical Resistance | Definition and Unit

2020-08-11T16:25:00.003+05:30

In this Post you will learn about Electrical Resistance and its defination and the unit of Electrical Resistance, symbol. the Electrical Resistance is the main and important concept in electrical feild.

Definition -

It may be defined as the property of a substance due to which it opposes (or restricts) the flow of electricity (i.e., electrons) through it.

When a voltage is applied across a substance there will be an electric current through it. The applied voltage across the substance is directly proportional to the current through it. The constant of proportionality is resistance. Hence resistance is defined as the ratio of applied voltage to the current through the substance.

Where V is voltage, I is current and R is resistance.

The Unit of Resistance

The practical unit of resistance is ohm.

* A conductor is said to have a resistance of one ohm if it permits one ampere current to flow through it when one volt is impressed across its terminals. For insulators whose resistances are very high, a much bigger unit is used i.e., mega-ohm = 10⁶ ohm (the prefix ‘mega’ or mego meaning a million) or kilo-ohm = 10³ ohm (kilo means thousand). In the case of very small resistances, smaller units like milli-ohm = 10⁻³ ohm or micro-ohm = 10⁻⁶ ohm are used. The symbol for ohm is Ω.

Electric Circuits - Definition and basic concept of electrical circuits

2020-07-05T20:35:00.004+05:30

What is an Electric Circuit?

In this article you will learn about Electrical Circuits in simple language with definition and easy concept.

Definition

An Electric Circuit is a path in which electrons from a voltage or current source flow.

An electrical circuit is a path or line through which an electrical current flows. The path may be closed (joined at both ends), making it a loop. A closed circuit makes electrical current flow possible. It may also be an open circuit where the electron flow is cut short because the path is broken. An open circuit does not allow electrical current to flow.

Below is a basic set of symbols that you may find on circuit diagrams.

It is very important to know the basic parts of a simple circuit and the symbols that relate to them. A simple circuit has conductors, a switch, a load and a power source.

Parts of an Electrical Circuit

Conductors:

These are usually copper wires with no insulation. They make the path through which the electricity flows. One piece of the wire connects the current from the power source (cell) to the load. The other piece connects the load back to the power source.

Switch:

The switch is simply a small gap in the conductor where you can close or open the circuit. When the switch is closed, the circuit is closed and electricity flows.

The Load:

The load is a small light bulb or buzzer that lights when the circuit is turned on. The load is also known as a resistor.

Cell:

The power source is a cell.

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learn about Electric Current – Definition, Unit, Symbol

2020-06-15T17:07:00.005+05:30

In this Post you will learn about Electric Current and its defination and the unit of electric current, symbol. the electric current is the main and important concept in electrical feild. To Operate Any Circuit the Electric Current is required to operate it.

Content

1. Definition

2. Unit

3. Symbol

What is Electric current?

Definition - In a simple language The Flow of Electron is Called as Electric Current. In other words Electric current is defined as the rate of flow of negative charges of the conductor.

Electric Current Unit - SI unit of Electric Current is the Ampere. Since the charge is measured in coulombs and time in seconds. so the unit of electric current is coulomb/Sec (C/s) or amperes (A). The ampere (symbol: A) is an SI base unit Electric current which is measured by Ammeter.

The Symbol of Electric Current - I is The conventional symbol for current. Originates from the French phrase intensité du courant, (current intensity).

Conclusion - We (Electrical Zilla) hope! you understand every thing about electric current. Enjoy the knowledge and stay connected with Electrical Zill.

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