Electric Current Basics

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What is electric current?
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Electric current is the flow of electric charge through a conductor, typically measured in amperes.
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What unit is used to measure electric current?
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The unit used to measure electric current is the ampere (A).
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What is a conductor in the context of electric current?
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A conductor is a material that allows electric current to flow easily through it.
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What is the difference between alternating current (AC) and direct current (DC)?
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Alternating current (AC) changes direction periodically, while direct current (DC) flows in one direction.
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Why is copper commonly used for electrical wiring?
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Copper is commonly used because it has high electrical conductivity and is relatively inexpensive.
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What is Ohm's Law?
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Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
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What role does resistance play in an electrical circuit?
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Resistance opposes the flow of electric current in a circuit, measured in ohms (Ω).
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How does a circuit breaker work in an electrical circuit?
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A circuit breaker automatically interrupts current flow when it exceeds a certain level to prevent damage or fires.
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What is electric power in the context of electric current?
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Electric power is the rate at which electrical energy is transferred by an electric circuit, measured in watts (W).
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What happens when resistance in a circuit increases?
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When resistance increases, the current in the circuit decreases, given a constant voltage supply.
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Why is silver not commonly used for electrical wiring despite its high conductivity?
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Silver is not commonly used because it is much more expensive than copper and less abundant.
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What is short circuit?
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A short circuit occurs when a low resistance path bypasses part of a circuit, causing excessive current flow.
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How do electrons flow in a circuit?
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Electrons flow from the negative terminal to the positive terminal of a power source within a circuit.
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What are insulators in electric circuits?
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Insulators are materials that do not allow electric current to flow through them easily.
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What determines the direction of electric current?
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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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