RC Time Constant in RC Circuits
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Questions and Answers

The instantaneous voltage across resistor R is eR = E – ______

ec

The instantaneous current passing through R and C is eR iC = R E - ______

eC

If the charge on the capacitor C is zero at the instant that the switch is closed, then at t = 0, the current passing through R and C is E - eC iC = R ______

10 v

This current causes the capacitor C to charge with the polarity illustrated, so that at time t1, the capacitor voltage eC could be ______ volts

<p>3</p> Signup and view all the answers

This alters eR eR = E – ec = 10 v – 3 v = ______ v

<p>7</p> Signup and view all the answers

Because C has accumulated some charge, eC is increased and the voltage across R is reduced; thus the charging current through R is also ______

<p>reduced</p> Signup and view all the answers

The product RC is the time constant of the RC circuit. It is the time when the capacitor is charged to 63.2% E, regardless of the value of E, R, and C. At time 5 RC, the capacitor is charged to 99.3% E, regardless of the value of E, R, and C. For practical purposes, it is assumed that the capacitor is fully charged or discharged at t = ____ RC.

<p>5</p> Signup and view all the answers

The exponential constant in the RC circuit operation equation is represented by the symbol ______

<p>e</p> Signup and view all the answers

When the capacitor is discharged through a resistor without a supply voltage, the capacitor voltage at any time during discharge can be computed using the equation ec = E - (E - Eo)e^(-t/RC), where ec represents the ______

<p>capacitor voltage</p> Signup and view all the answers

At t = RC, the current flowing through R and C is _____ % I. Where I is the initial charging current which is equal to E / R.

<p>36.8</p> Signup and view all the answers

In an RC circuit, if the capacitor initially has a voltage of -3 volts and is charged from a 6V source through a 10kohm resistor, the capacitor voltage after 8 ms will be ______ volts

<p>1.96</p> Signup and view all the answers

When a capacitor is charged from a DC voltage source through a resistor, the instantaneous level of the capacitor voltage may be calculated at any given time. There is a definite relationship between the time constant of the RC network and the time required for the capacitor to charge to approximately _____ % and 99% of the input voltage.

<p>63</p> Signup and view all the answers

Regardless of the values of E, R, and C, the capacitor reaches 63.2% of the charging voltage when the time is equal to ______

<p>RC</p> Signup and view all the answers

During the time that input voltage is positive, C is charged towards the peak voltage of the input signal. The output voltage across R is equal to the input V1 voltage minus the voltage across the _____.

<p>capacitor</p> Signup and view all the answers

The initial charge on the capacitor in an RC circuit is denoted by the symbol ______

<p>Eo</p> Signup and view all the answers

When the input signal becomes 0 V, the capacitor discharges through R, during which the current is in the reverse direction, causing a negative going pulse across _____.

<p>R</p> Signup and view all the answers

RC Time Constant represents the time when the capacitor is charged to _____% of the input voltage, regardless of the specific values of E, R, and C.

<p>63.2</p> Signup and view all the answers

The time constant in an RC circuit is given by the product of the resistance R and the capacitance C, represented as ______

<p>RC</p> Signup and view all the answers

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