AC Through a Resistor

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What is the basic behavior of AC through a resistor?
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The voltage and current remain in phase in a resistor when AC passes through it.
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How does the power dissipated in a resistor differ in AC compared to DC?
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In AC, power dissipated in a resistor is given by P = I_rms²R, where I_rms is the root mean square current.
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What is the formula for calculating RMS voltage in a resistive AC circuit?
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The formula is V_rms = V_peak / √2.
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Why is impedance in a resistor the same as its resistance?
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Because impedance encompasses both resistance and reactance, but in a resistor, reactance is zero.
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How does the phase angle behave in a purely resistive AC circuit?
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The phase angle is 0 degrees because voltage and current are in phase.
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Which law governs the relationship between current and voltage in a resistor?
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Ohm's Law, which states V = IR.
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How can we express power in terms of voltage and resistance in AC circuits?
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Power can be expressed as P = V_rms² / R.
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What does in-phase imply when referring to voltage and current in a resistor?
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In-phase means the peaks and zero-cross points of voltage and current occur simultaneously.
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Why are resistors considered simpler components in AC analysis?
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They exhibit no phase shift and their impedance equals their resistance.
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What is the role of a resistor in an AC circuit?
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A resistor limits the current flow and dissipates electrical energy as heat.
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What impact does frequency have on a resistor in an AC circuit?
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Frequency does not affect a resistor; its resistance remains constant regardless of frequency changes.
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Can resistors create a phase shift in an AC circuit?
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No, resistors do not cause phase shifts between voltage and current in an AC circuit.
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What component in a resistor accounts for its AC properties?
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The material's resistivity and physical dimensions define a resistor's AC characteristics.
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How is total resistance in series resistors calculated in AC circuits?
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Total resistance in series resistors is the sum of individual resistances.
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What safety precautions should be considered when working with resistors in AC circuits?
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Ensure resistor wattage rating exceeds power dissipation, preventing overheating.
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