# Electric Current Overview

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## 16 Questions

Electrons

Magnetic fields

Ampere

Ammeter

Semiconductors

Charge carriers

Charge carriers

Electrons

### Who used the symbol I to represent current in formulating Ampère's force law?

André-Marie Ampère

### What are the charge carriers in semiconductors?

Positive or negative

### Why is a convention needed for the direction of current that is independent of the type of charge carriers?

Because current can be the flow of either positive or negative charges, or both

### What does a flow of positive charges give in an electrical circuit?

The same electric current as an equal flow of negative charges in the opposite direction

### What is meant by the reference direction of the current I?

The direction representing positive current specified by an arrow on the circuit schematic diagram

### When analyzing electrical circuits, why are the reference directions of currents often assigned arbitrarily?

The actual direction of current through a specific circuit element is usually unknown until the analysis is completed

### 'Ohm's law' states what relationship?

$I = V/R$

### What does Ohm's law state about the relationship between current, voltage, and resistance?

$I = V/R$

Test your knowledge of electric current with this quiz covering the definition, properties, and behavior of electric currents in conductors, semiconductors, and electrolytes.

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