[[Image:High voltage warning.svg|right|thumb|Simbol keselamatan sedunia "Awas, risiko kejutan eletrik" (ISO 3864), secara tidak rasmi dikenali sebagai ''simbol'' [[voltan tinggi|''bervoltan tinggi'']].]]
'''Voltan''' (kadang-kala dikenali sebagai ''eletrik'' atau ''electrical tension'') adalah [[potentialBeza differencekeupayaan|perbeza keupayaan (''difference of electrical potential'')]] antara dua titik eletrik atau [[litar eletronik]], digambarkan sebagai [[volt]].<ref>"voltage", ''A Dictionary of Physics''. Ed. John Daintith. Oxford University Press, 2000. Oxford Reference Online. Oxford University Press.</ref> Ia mengukur potensi tenaga bagi medan eletrik untuk menghasilkan arus eletrik dalam pengalir eletrik. Bergantung kepada perbezaan potensi eletrik ia dikenali sebagai voltan amat rendah, voltan rendah, voltan tinggi atau voltan amat tinggi.
==Penjelasan=
:<math> R = \frac{V}{I} </math>
WhereDi mana ''V'' = voltage/potential difference, ''I'' = current intensity, ''R'' = resistance, ''P'' = power/watts
===litar AC ===
:<math> V = \frac{IR}{\cos\phi}</math>
WhereDi mana ''V''=voltage, ''I''=current, ''R''=resistance, ''P''=true power, ''Z''=impedance, ''φ''=phasor angle between ''I'' and ''V''
===Penukaran AC ===
:<math> V_{avg} = 0.900\,V_{rms} = \frac{2 \sqrt{2}}{\pi} V_{rms}\!\ </math>
WhereDi mana ''V''<sub>pk</sub>=peak voltage, ''V''<sub>ppk</sub>=peak-to-peak voltage, ''V''<sub>avg</sub>=average voltage over a half-cycle, ''V''<sub>rms</sub>=effective ([[root mean square]]) voltage, and we assumed a sinusoidal wave of the form <math> V_{pk} \sin(\omega t - k x) </math>, with a period <math> T = 2\pi/\omega </math>, anddan wheredi themana anglesudut bracketskurungan (dalam persamaan punca kuasa -purata-asas (''in the root-mean-square equation'')) denotemewakili apurata timetempoh averagebagi overkeseluruhan an entire periodmasa.
===Voltan penuh===
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