Tue. Jul 5th, 2022

# Defining Electric Current

May 25, 2022

## Defining Electric Current

Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere.

#### Conventional Current Flow

The conventional current flow is from the positive to the negative terminal and indicates the direction in which positive charges would flow.

#### Electron Flow

The electron flow is from negative to positive terminal. Electrons are negatively charged and are therefore attracted to the positive terminal as unlike charges attract.

## Properties of Electric Current

1. The electric current is measured in amperes.
2. The conventional direction of an electrical current is the direction during which a charge would move.

## Important terms to learn

1. Electric Charge Charge is the property associated with the matter due to which it produces and experiences electric and magnetic effects.

Two kinds of electric charges are there

• positive(+) charge
• negative(-) charge

Various properties of charge include the following:

• Conservation of Electric Charge
• Quantization of Electric Charge

2. Conductors and Insulators Those substances which readily allow the passage of electricity through them are called conductors, e.g. metals, the earth, and those substances which offer high resistance to the passage of electricity are called insulators, e.g. plastic rod and nylon.
3. Transference of electrons is the cause of frictional electricity.
4. Additivity of Charges Charges are scalars and they add up like real numbers. It means if a system consists of n charges q1, q2, q3 , … ,qn, then a total charge of the system will be q1 +q2 + … +qn.
5. Conservation of Charge The total charge of an isolated system is always conserved, i.e. initial and final charge of the system will be the same.

## Is Electric Charge a Vector Quantity?

No, it is a scalar quantity.