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preface to fifteenth edition

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GENERAL INFORMATION, CONVERSION TABLES, AND MATHEMATICS 2.11<br />

TABLE 2.2<br />

Physical and Chemical Symbols and Definitions (Continued)<br />

E. Electricity and magnetism<br />

Name Symbol SI unit Definition<br />

Admittance Y S Y 1/Z<br />

Capacitance C F,C·V 1 C Q/U<br />

Charge density C·m 3 Q/V<br />

Conductance G S G 1/R<br />

Conductivity S·m 1 1/<br />

Dielectric polarization (dipole<br />

P C·m 2 P D 0 E<br />

moment per volume)<br />

Electrical resistance R R U/I V/I<br />

Electric current I A I dQ/dt<br />

Electric current density j, J A·m 2 I jdA<br />

Electric dipole moment p, C·m p Qr<br />

Electric displacement D C·m 2 D E<br />

Electric field strength E V·m 1 E F/Q grad V<br />

Electric flux C D dA<br />

Electric potential V, V, J · C 1 V dW/dQ<br />

Electric potential difference U, V V U V 2 V 1<br />

Electric susceptibility e e r 1<br />

Electromotive force E V E (F/Q) ds<br />

Impedance Z Z R iX<br />

Loss angle f rad (/2) I U<br />

Magnetic dipole moment m, A·m 2 E p mB<br />

Magnetic field strength H A·m 1 B H<br />

Magnetic flux Wb B dA<br />

Magnetization (magnetic dipole<br />

M A·m 1 M (B/ 0 ) H<br />

moment per volume)<br />

Magnetic susceptibility , r 1<br />

Magnetic vec<strong>to</strong>r potential A Wb · m 1 B A<br />

Molar magnetic susceptibility<br />

m n 3 /mol m V m <br />

Mutual inductance M, L 12 H E 1 L 12 (dI 2 /dt)<br />

Permeability H·m 1 B H<br />

Permeability of vacuum 0 H·m 1<br />

Permittivity F·m 1 D E<br />

Permittivity of vacuum 0 F·m 1 0 1<br />

c2<br />

0 0<br />

Poynting vec<strong>to</strong>r S W·m 2 S E H<br />

Quantity of electricity, electric<br />

Q C<br />

charge<br />

Reactance X X (U/I) sin <br />

Relative permeability r r / 0<br />

Relative permittivity g r r / 0<br />

Resistivity ·m E/j<br />

Self-inductance L H E L(dI/dt)<br />

Susceptance B S Y G iB<br />

f<br />

I and U are the phases of current and potential difference.<br />

g<br />

This quantity was formerly called the dielectric constant.

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