Electric Current Basics

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What is electric current?

Electric current is the flow of electric charge through a conductor, typically measured in amperes.

What unit is used to measure electric current?

The unit used to measure electric current is the ampere (A).

What is a conductor in the context of electric current?

A conductor is a material that allows electric current to flow easily through it.

What is the difference between alternating current (AC) and direct current (DC)?

Alternating current (AC) changes direction periodically, while direct current (DC) flows in one direction.

Why is copper commonly used for electrical wiring?

Copper is commonly used because it has high electrical conductivity and is relatively inexpensive.

What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

What role does resistance play in an electrical circuit?

Resistance opposes the flow of electric current in a circuit, measured in ohms (Ω).

How does a circuit breaker work in an electrical circuit?

A circuit breaker automatically interrupts current flow when it exceeds a certain level to prevent damage or fires.

What is electric power in the context of electric current?

Electric power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W).

What happens when resistance in a circuit increases?

When resistance increases, the current in the circuit decreases, given a constant voltage supply.

Why is silver not commonly used for electrical wiring despite its high conductivity?

Silver is not commonly used because it is much more expensive than copper and less abundant.

What is short circuit?

A short circuit occurs when a low resistance path bypasses part of a circuit, causing excessive current flow.

How do electrons flow in a circuit?

Electrons flow from the negative terminal to the positive terminal of a power source within a circuit.

What are insulators in electric circuits?

Insulators are materials that do not allow electric current to flow through them easily.

What determines the direction of electric current?

The direction of electric current is determined by the flow of conventional current from positive to negative, contrary to electron flow.

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