Electricity in Physics - Physics

# Electricity in Physics - Physics | General Awareness & Knowledge - Bank Exams PDF Download

 Table of contents Electric current Direct & Alternating current Electromagnetism Generating Electrical Current Hydel-Power station Fuse Wire

## Electric current

• An electric current is a flow of electric charge through an electrical conductor.
• In electric circuits this charge is often carried by moving electrons in a wire.
• It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma.
• The SI unit for measuring an electric current is the ampere, which is the flow of electric charges through a surface at the rate of one coulomb per second.
• Electric current can be measured using an ammeter.

## Direct & Alternating current

• Direct current (DC) is the unidirectional flow of electric charge.
• Direct current is produced by sources such as batteries, thermocouples, solar cells, and dynamo .
• In alternating current (AC), the movement of electric charge periodically reverses direction.

## Electromagnetism

• Electric current produces a magnetic field. The magnetic field can be visualized as a pattern of circular field lines surrounding the wire that persists as long as the current flows.
• Magnetism can also produce electric currents.
• When a changing magnetic field is applied to a conductor, an EMF is produced, and when there is a suitable path, this causes current to flow.
• Electric current can be directly measured with a galvanometer

Electromagnetism

## Generating Electrical Current

• Electrical current can be generated by moving a metal wire through a magnetic field.
• This applies both to alternating current (AC) and direct current (DC) electricity.
• This is a different method than where DC is created by a battery, which uses chemical reactions.

Generation of electric current

• Electrical generators rotate a coil of wires through a magnetic field.
• An electric motor is very similar to a generator, except that power is provided to turn the rotors.

Electrical Generators

## Hydel-Power station

Hydel Power Station

## Fuse Wire

• Fuse Wire is used in a circuit to control the maximum current flowing in a circuit. It is a thin wire having high resistance and is made up of a material with low melting point.
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## General Awareness & Knowledge

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## FAQs on Electricity in Physics - Physics - General Awareness & Knowledge - Bank Exams

 1. What is electric current?
Ans. Electric current refers to the flow of electric charge in a conductor. It is the rate at which electric charges pass through a given point in a circuit. The unit of electric current is the ampere (A), and it is represented by the symbol 'I'.
 2. What is the difference between direct current and alternating current?
Ans. Direct current (DC) flows in only one direction, maintaining a constant polarity. It is typically produced by batteries and solar cells. Alternating current (AC), on the other hand, periodically changes its direction and magnitude. AC is the most common form of electric power and is used for transmitting electricity over long distances.
 3. What is electromagnetism?
Ans. Electromagnetism is the branch of physics that deals with the interaction between electric currents and magnetic fields. It is a fundamental force of nature and plays a crucial role in various technological applications, such as electric motors, generators, and transformers.
 4. How is electrical current generated?
Ans. Electrical current can be generated in various ways. One common method is by rotating a coil of wire within a magnetic field, which induces a current in the wire due to electromagnetic induction. This principle is employed in generators and alternators to produce electricity.
 5. What is a hydel-power station?
Ans. A hydel-power station, also known as a hydroelectric power plant, is a facility that generates electricity by harnessing the energy of flowing or falling water. It typically involves the construction of a dam to create a reservoir, which then drives turbines to generate electrical power. Hydel-power stations are considered a renewable and clean source of energy.

## General Awareness & Knowledge

389 videos|546 docs|149 tests

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