Question

Explain how current and voltage change for EACH of the following 1. Resistor 2.Capacitor 3.Inductor

Explain how current and voltage change for EACH of the following

1. Resistor

2.Capacitor

3.Inductor

Science   Physics   
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Homework Answers

Answer #1

1. Resistor : a resistor is simple energy dissipating passive device. It's voltage and current have linear relationship  

So it's voltage and current are in phase and vary linearly.

2. Capacitor : a capacitor is an energy storage device which follows relation between charge and voltage as

Q=CV

Differentiating this equation we get current

Which means voltage and current have a phase difference of 90°. So they always stay out of phase and current is 90° ahead of voltage.

3. Inductor : inductor is magnetic energy storage device. It's voltage , inductance and current hold a relationship as

So here also both voltage and current are out of phase and voltage is 90° ahead of current .

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