What are the topics under current electricity?
Topics covered: Electric Current, Resistance, Resistivity, Current Density, Ohm’s Law and Mathematical Expression for Current Density, Limitations of Ohm’s Law, Drift Velocity and Mobility of Electrons, Colour Coding of Carbon Resistors, Temperature Dependence of Resistivity Electrical Energy & Power.
How important is current electricity?
Current is one of the most important and fundamental elements within electrical and electronic technology. The current flowing in a circuit can be used in a variety of ways from generating heat to causing circuits to switch, or information to be stored in an integrated circuit.
What is required for current electricity?
To produce an electric current, three things are needed: a supply of electric charges (electrons) which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges.
What are types of current?
There are two kinds of current electricity: direct current (DC) and alternating current (AC). With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.
What are types of electricity?
Types of Electricity – Modern Methods. There are two types of Electricity, Static Electricity and Current Electricity. Static Electricity is made by rubbing together two or more objects and making friction while Current electricity is the flow of electric charge across an electrical field.
What is electric current in short answer?
An electric current is a flow of particles (electrons) flowing through wires and components. It is the rate of flow of charge. If the electric charge flows through a conductor, we say that there is an electric current in the conductor. In the circuits using metallic wires, electrons constitute a flow of charges.
How is electric current generated?
When a voltage is applied to a conductor or semiconductor, electric current starts flowing. In conductors, positively charged protons are held in a fixed position and the negatively charged electrons move from one place to another place by carrying the charge. Thus, electrons conduct electric current in conductors.
What is electric current symbol?
Current is usually denoted by the symbol I. Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.
What are the basics of electricity?
The three most basic components of electricity are voltage, current, and resistance.
- VOLTAGE is like the pressure that pushes water through the hose. It is measured in volts (V).
- CURRENT is like the diameter of the hose. …
- RESISTANCE is like sand in the hose that slows down the water flow.
What are the main uses of electricity?
People use electricity for lighting, heating, cooling, and refrigeration and for operating appliances, computers, electronics, machinery, and public transportation systems.