# Electromagnetic Constants

### - table or chart of electromagnetic constants including symbol, value and units for values such as elementary charge, magnetic flux quantum, Josephson frequency voltage quotient, etc.

### In this section

Electromagnetic constants are used in many areas of science and electronics for a variety of calculations.

The electromagnetic constants that come under the universal constants heading include items such as the elementary charge, magnetic flux quantum, Josephson frequency voltage quotient, etc.

Details for these electromagnetic constants and more are given below. The constant name, symbol, value, units and the relative uncertainty are provided.

Constant name | Symbol of constant | Value | Units | Relative Uncertainty |
---|---|---|---|---|

Elementary charge | e |
1.602 177 33 | 10^-19 C |
0.30 |

Elementary charge | e/h |
2.417 988 36 | 10^14 A J^-1 |
0.30 |

Magnetic flux quantum | φ0 |
2.067 834 61 | 10^-15 Wb |
0.30 |

Josephson frequency-voltage quotient | 2e/h |
4.835 9767 | 10^14 Hz V^-1 |
0.30 |

Quantised Hall conductance | e^2/h |
3.784 046 14 | |
0.045 |

Quantised Hall resistance | RH |
25.812 8056 | Ω |
0.045 |

Bohr magneton | µB |
9.274 0154 | 10^-24 J T^-1 |
0.34 |

Nuclear magneton | µN |
5.050 7866 | 10^-27 J T^-1 |
0.34 |

## Read more popular reference pages & tables . . . . . |
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• dBm / Watts table | • Trig functions | • Fourier series | • Constants |

• SI base units | • SI prefixes | • Sidereal time | • Greek letters |

• Resistivity | • Physical constants | • Capacitance | • Circuit symbols |

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