# What affects the size of the current?

## What affects the size of the current?

length – longer wires have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.

Does current depend on size of wire?

The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current. When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.

### What is the size of an electric current?

A common unit of electric current is the ampere, which is defined as a flow of one coulomb of charge per second, or 6.2 × 1018 electrons per second. The centimetre–gram–second units of current is the electrostatic unit of charge (esu) per second. One ampere equals 3 × 109 esu per second.

How does an electric current flow?

The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.

## Does current increase with distance?

Actually, electric potential decreases as you move farther from a charge distribution. In the same way, as you do work on a charge to move it closer to another charge of the same sign, you increase the electric potential energy.

Does amperage increase with distance?

Amps is the same for the entire circuit no matter how long the circuit is. It does not change over distance. The voltage will drop due to resistance of the wire. When the voltage drops the amps could go up and more voltage drop occurs.

### What determines the current of a circuit?

The amount of current in a circuit depends on the amount of voltage available to motivate the electrons, and also the amount of resistance in the circuit to oppose electron flow. Just like voltage, resistance is a quantity relative between two points.

How is current determined?

As a physical quantity, current is the rate at which charge flows past a point on a circuit. As depicted in the diagram below, the current in a circuit can be determined if the quantity of charge Q passing through a cross section of a wire in a time t can be measured. The standard metric unit for current is the ampere.