Exam 29: Alternating-Current Circuits

You connect a 250- $\Omega$ resistor,a 1.20-mH inductor,and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz,120-V (peak)source.The approximate impedance of your circuit is

A circular coil with 20 turns and radius 5 cm is rotated in a uniform magnetic field of 3.2 T.If the maximum voltage induced in the coil is 5 V,calculate the number of rotations of the coil per minute.

The SI units of inductance times capacitance are

You want the output current from the secondary coil of a transformer to be 10 times the input current to the primary coil.The ratio of the number of turns N₂/N₁ must be

The resistance of the armature windings of DC motor is 5 $\Omega$ .The motor is connected to a 120 V line.When the motor is spinning at full speed,it draws a current of 4 A.The bACk EMF at full speed is

You connect a 100- $\Omega$ resistor,a 800-mH inductor,and a 10.0- $\mu$ F capacitor in series across a 60.0-Hz,120-V (peak)source.The approximate resonant frequency of your circuit is

A capacitor is placed across an AC generator that has a maximum EMF of 170 V.For a frequency of 3000 Hz,the maximum current through the capacitor is 12 A.Find the value of the capacitor.

A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor.The maximum current in this circuit after a long time has passed will be

A series RLC circuit is driven by a 1.0-kHz oscillator.The circuit parameters are L = 5.0 mH,C = 4.0 $\mu$ F,R = 10 $\Omega$ .What is the resonance frequency of the circuit?

A series RLC circuit is driven by a 1.0-kHz oscillator.The circuit parameters are V_rms = 12 V,L = 5.0 mH,C = 4.0 $\mu$ F,and R = 10 $\Omega$ .Under steady-state conditions,the rms potential difference across the resistor will be

An AC generator supplies 22 rms volts to a 30- $\Omega$ resistor at 50 Hz.What is the maximum current in the resistor?

Use the following figure for the next problem. An AC power supply, V = 20 V sin where = 200 rad/s is connect to an inductor L = 180 mH and a capacitor C = 25 XL = 36 ohms, XC = 200 ohms, Z = 43.9 ohms -What is the impedance of the circuit?

Which of the following statements about an inductor that is connected to an AC voltage is true?

A series RLC circuit is driven by a 1.0-kHz oscillator.The circuit parameters are V_rms = 12 V,L = 5.0 mH,C = 4.0 $\mu$ F,and R = 10 $\Omega$ .Under steady-state conditions,the rms potential difference across the inductor will be

What is the resistance of a regular 75-W light bulb connected to a 120-V AC outlet?

You place a 50-mH inductor across an AC generator that has a maximum EMF of 120 V.The inductive reactance when the frequency is 60 Hz is approximately

An AC motor can be turned into an AC generator by

You connect a 250- $\Omega$ resistor,a 1.20-mH inductor,and a 1.80-pF capacitor in series across a 60.0-Hz,120-V (peak)source.The Q factor for this circuit is approximately

You connect a 250- $\Omega$ resistor,a 1.20-mH inductor,and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz,120-V (peak)source.The resonant frequency of your circuit is approximately

Which of the following statements about a capacitor that is connected to an AC voltage is true?