ACL2L5

A 120-volt AC circuit supplies a 3-ohm resistor in parallel with a 6-microfarad capacitor. What is the voltage across the resistor?

120 V 5Q4

A 120-volt AC circuit supplies a 3-ohm resistor in parallel with a 6-microfarad capacitor. What is the voltage across the capacitor?

120 V 5Q5

the following question are un-included

5Q 7, 8 , 9

What is the value of C in a parallel RC circuit that has a resistance of 470 ohms, a reactance of 330 ohms, and an applied voltage of 470 volts, if the frequency is 1,025 hertz? Calculate to the nearest whole number of the unit specified..

C = 1 / 2 / pi / 1,025 / X_C_ C = 1 / 2 / pi / 1,025 / 330 C = 471 nF 5Q16

Solve for the total capacitance of a branching circuit given B1 = R_1_ = 24 ohms b2 = R_2_ = 12 ohms B3 = C_1_ = 6 uF B3 = C_2_ 4 uF

C_T_ = C_1_ + C_2_ C_T_ = .000006 + .000004 C_T_ = 10 uF 5Q2

A parallel RC circuit has a resistance of 470 ohms, a reactance of 330 ohms, and an applied voltage of 470 volts. Solve for the impedance of the circuit by determining the branch currents and the total current. (Round the FINAL answer to one decimal place.) The values calculated for this question will be used for additional questions.

I_R_ = E / R I_R_ = 470 / 470 I_R_ = 1 I_C_ = E / X_C_ I_C_ = 470 / 330 I_C_ = 1.424 I_T_ = sqrt( I_R_^2 + I_C_^2) I_T_ = sqrt (1^2 + 1.424^2) I_T_ = 1.74 Z = E_T_ / I_T_ Z = 470 / 1.74 Z = 270.1 ohms 5Q15

Given a branching circuit w/ E = 240 V b1 = R = 200 ohms b2 = X_C_ = 100 ohms Then would... Current in the capacitive branch is in-phase with the voltage.

No 5Q6

A parallel RC circuit has a resistance of 470 ohms, a reactance of 330 ohms, and an applied voltage of 470 volts at 1,025 hertz. If the frequency is doubled to 2,050 hertz, what is the phase angle? Calculate your answer to the nearest whole number angle value.

Note: If the frequency is doubled, XC will be cut in half, and the current in the capacitive branch will double. IC @ 1,025 Hz = 1.424; therefore, IC @ 2,050 = 2.848 Tan(theta) = Opp / Adj Tan(theta) = 2.848 / 1 Tan(theta) = 2.848 theta = atan(2.848) theta = 70.6 degrees theta = 71 degrees 5Q18

Solve for the total resistance of a branching circuit given B1 = R_1_ = 24 ohms b2 = R_2_ = 12 ohms B3 = C_1_ = 6 uF B3 = C_2_ 4 uF

R = 8 ohms b/c R = R_1_ * R_2 / ( R_1_ + R_2_ ) R = (24 * 12 )/ (24 + 12) 5Q1

When the resistance is equal to the impedance, true power will be equal to apparent power.

True Note: True power is consumed by the resistive elements in the circuit; if R is equal to Z, θ = 0°, and PF = 100%. 5Q12

In any reactive circuit, apparent power is larger than true power.

True 5Q11

When more parallel paths are added to a parallel circuit, the number of current paths is increased and the total opposition of the circuit is reduced.

True 5Q3

If a parallel RC circuit has a large I_C_and a small I_R_, the phase angle is closer to 90°.

True 5Q9

Given a branching circuit w/ E = 240 V b1 = R = 200 ohms b2 = X_C_ = 100 ohms Then would... The current in the resistive branch is in-phase with the voltage.

Yes 5Q6

A parallel RC circuit has a resistance of 470 ohms and a reactance of 330 ohms. Determine the impedance of the circuit using the formula: Z = (R * X_C_ ) / <sqrt( R^2 = X_C_^2)> Round answer to nearest whole number

Z = 470 X 330 / sqrt(470^2 +330^2) =270 ohms 5Q14

Total current times applied voltage equals the ? .

apparent power 5Q10

What is the phase angle of a parallel RC circuit that has a resistance of 470 ohms, a reactance of 330 ohms, and an applied voltage of 470 volts, if the frequency is 1,025 hertz? (Round the FINAL answer to one decimal place.)

cos(theta) = Adj / Hyp = I_R_ / I_T_ cos(theta) = 1 / 1.74 cos(theta) = 0.5747 theta = acos(0.5747) theta = 54.9 degrees 5Q17

If frequency is increased in a parallel RC circuit then... The capacitive reactance would ?

decrease 5Q13

If frequency is increased in a parallel RC circuit then... The impedance would ? .

decrease 5Q13

If frequency is increased in a parallel RC circuit then... The power factor would ?

decrease 5Q13

If frequency is increased in a parallel RC circuit then... The phase angle ?

increase 5Q13

If frequency is increased in a parallel RC circuit then... The total current would ?

increase 5Q13

Given a branching circuit w/ E = 240 V b1 = R = 200 ohms b2 = X_C_ = 100 ohms Then would... Voltages across the resistive and capacitive branches are 90° out-of-phase.

no 5Q6

Given a branching circuit w/ E = 240 V b1 = R = 200 ohms b2 = X_C_ = 100 ohms Then would... Current in the capacitive branch leads the current in the resistive branch by 90°.

yes 5Q6