## Principles of Electricity and Electromagnetism |

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Page 224

Thus condensers designed for direct current frequently fail on

At very high frequencies only gases are satisfactory dielectrics, though quartz,

paraffin, isolantite, etc., can be used where their mechanical properties are ...

Thus condensers designed for direct current frequently fail on

**alternating current**.At very high frequencies only gases are satisfactory dielectrics, though quartz,

paraffin, isolantite, etc., can be used where their mechanical properties are ...

Page 385

In this way a unidirectional

produced. Such a machine is known as a direct-

Each system ...

In this way a unidirectional

**current**of essentially constant magnitude may beproduced. Such a machine is known as a direct-

**current**generator. Both**alternating**and direct**currents**are widely used for the transmission of power.Each system ...

Page 417

measurement the line voltage is reduced till the motor draws a normal current the

actual stalled current that would be ... Hence the torque continues in the same

direction for both halves of the

measurement the line voltage is reduced till the motor draws a normal current the

actual stalled current that would be ... Hence the torque continues in the same

direction for both halves of the

**alternating**-**current**wave, and the motor can be ...### What people are saying - Write a review

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### Common terms and phrases

alternating current alternating-current ampere amplifier amplitude angle angular anode antenna applied approximately armature assumed atom axis calculated capacity cathode cell characteristic charge circuit coefficient coil component condenser conducting conductor considered constant curl current flowing curve deflection density determined dielectric dielectric constant direct-current direction discharge effective electric field electromagnetic electromotive force electrons electrostatic element energy equal equation flux force frequency function galvanometer given grid hence impedance induction integral ions known Laplace's equation length linear load magnetic field magnetic induction magnitude maximum measured metal meter negative normal obtained ohms oscillations output parallel phase plane plate polarization positive potential difference potential wave potentiometer produced proportional quantities radiation radius ratio reactance region represents resistance resonant rotation scalar Show shown in Fig solenoid solution surface temperature terminals theorem torque tube unit vector velocity voltage volts wire written zero