## Principles of Electricity and Electromagnetism |

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Page 217

The high input resistance makes the vacuum tube useful as a voltmeter, for its

grid circuit draws very little current and

measurement. A discussion of a typical voltmeter circuit, such as that of Fig. 7.17

...

The high input resistance makes the vacuum tube useful as a voltmeter, for its

grid circuit draws very little current and

**hence**alters but slightly the circuit undermeasurement. A discussion of a typical voltmeter circuit, such as that of Fig. 7.17

...

Page 431

Let io be the effective current at resonance and i the effective current for some

arbitrary value of the reactance X. Then V2 - V2 *2 = 1 - 2 — * = R. and i R2 + X?

Let io be the effective current at resonance and i the effective current for some

arbitrary value of the reactance X. Then V2 - V2 *2 = 1 - 2 — * = R. and i R2 + X?

**hence**t; R2 w°C Here C, is the resonance setting of the condenser and the ...Page 600

equation becomes This is the basis of the electrostatic system of units (esu.). The

mechanical units are the centimeter, gram, and second; a unit charge is of such ...

**Hence**, for simplicity the constant in the Coulomb law is chosen as unity and theequation becomes This is the basis of the electrostatic system of units (esu.). The

mechanical units are the centimeter, gram, and second; a unit charge is of such ...

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