Exam 21: Alternating-Current Circuits and Electromagnetic Waves

In an RLC series circuit,if the AC frequency is increased to a very large value,what value does the phase angle between the current and voltage approach?

In the typical household AC voltage of 311 V,what is the peak voltage?

As an electromagnetic wave travels through free space,its speed can be increased by:

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

In an AC series circuit the inductive reactance is 41.0 Ω and the frequency is 137 Hz.What is the inductance in the circuit?

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

In an AC series circuit the capacitive reactance is 217 Ω and frequency is 56 Hz.What is the capacitance?

A series RLC circuit in a radio is in resonance with AM 700 kHz.If the radio station is changed to AM 2100 kHz,by what factor must the capacitance be multiplied to again achieve resonance?

An AC series circuit has 18.9-Ω resistance,21.1-Ω inductive reactance,and 15.5-Ω capacitive reactance.If an effective (rms)emf of 94 V is applied,what is the power output?

An object that is giving off only infrared electromagnetic waves is giving off heat through:

Glass panes are opaque to a certain type of radiation,which passes through quartz.What type of radiation is it? This radiation is important in ozone layer reactions.

The rms current is equal to the direct current that:

An AC voltage source,with a peak output of 72 V,results in dissipation of energy in a resistor at rate of 140 W.What is the value of the resistance?

In an RLC series circuit the capacitive reactance is 19.5 Ω.If the AC frequency triples,what will be the resulting capacitive reactance?

Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?

The rate of heat dissipation in an AC circuit with resistance,R,and effective current,I_rms,is given by which of the following?

An AM radio tuning circuit has a coil with an inductance of 3.93 mH and a capacitor set at 5.68 × 10−¹² F.What frequency will it detect?

The power dissipated in an AC series circuit increases as the phase angle approaches what value?

An RLC circuit is connected across an AC power source.Which statement is correct?​

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