Exam 22: Reflection and Refraction of Light: Part A

An AC power generator produces 25 A (rms)at 3600 V.The energy is transmitted through a long-distance power line,which has a total resistance of 50 Ω.What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?

In an LCR circuit,the maximum current is 1 amp.What is the average current?

What is the effective (rms)current value for an AC current with an amplitude of 20 A?

At what frequency does a 0.32-H inductor have the same reactance as a 0.22-μF capacitor?

A 400-Ω resistor and an inductor are connected in parallel across a 300-Hz source.If the amplitude of the current in the resistor is equal to that in the inductor,what is the value of the inductance?

In an LCR series circuit with X_L > X_C,the phase angle between the current and voltage phasors is 30°.If the AC frequency doubles,what is the magnitude of the resulting phase angle?

A resistor,inductor,and capacitor are connected in series,each with an effective (rms)voltage of 65 V,140 V,and 90 V,respectively.What is the magnitude of the phase angle between the current and applied voltage phasors in this circuit?

A series LCR AC circuit is at resonance.It contains a resistor of 16 Ω,a capacitor of 0.35 μF,and an inductor of 90 mH.If an effective (rms)voltage of 150 V is applied,what is the effective (rms)current when the circuit is in resonance?

In an AC circuit operating at a frequency where the phase angle with respect to the current is 30°,what happens to the phase angle if the capacitance of the circuit is increased?

In an AC series circuit the capacitive reactance is 253 Ω and frequency is 100 Hz.What is the capacitance?

A 17.0-μF capacitor is connected to an AC source with an rms voltage of 120 V and a frequency of 60.0 Hz.What is the rms current in the capacitor?

A series LCR circuit has a inductive reactance of 2 Ω and a capacitive reactance of 1/2 Ω.By what factor should the AC frequency be changed to put this circuit into resonance?

An electric motor produces 2.0 hp in a V_rms = 120 V circuit.Using 1 hp = 746 W,how long would it take this motor to do 1.0 kWh of work?

Consider an AC series circuit containing a coil,capacitor,and resistor.Doubling the frequency will change the capacitive reactance by what factor?

An AC voltage source,with a peak output of 200 V,is connected to a 25-Ω resistor.What is the effective (or rms)current in the circuit?

What is the impedance of an AC series circuit that is constructed of a 10.0-Ω resistor along with 24.0-Ω inductive reactance and 7.0-Ω capacitive reactance?

A 50-Ω resistor,a 0.1-H inductor,and a 20-µF capacitor are connected in series to a 60-Hz source.The rms current in the circuit is 3 A.Find the rms voltage across the resistor,the inductor,and the capacitor.

Consider an AC series circuit containing a coil,capacitor,and resistor.Doubling the frequency will change the circuit's impedance by what factor?

The output voltage of an AC generator is of the form V = V​₀ sin(2πft).A typical frequency in household circuits is 60 Hz.Using radians for angular measure in this equation,what is the factor 2πf in radians per second for this frequency?

What is the magnitude of the phase angle of an AC series circuit that is constructed of a 10.0-Ω resistor along with 20.00-Ω inductive reactance and 7.00-Ω capacitive reactance?