# AQA A-Level Physics/List of formulas

De Broglie wavelength: where h = Planck's Constant

**ELECTRICITY**

__Resistors in series__

__Resistors in parallel__

__Resistivity__

__Induced EMF__

__Alternating current__

De Broglie wavelength: ${\frac {h}{mv}}$ where h = Planck's Constant

**ELECTRICITY**

$I={\frac {V}{R}}$

$V={\frac {W}{Q}}$

$I={\frac {Q}{t}}$

__Resistors in series__

$R=R_{1}+R_{2}+R_{3}+.......$

__Resistors in parallel__

${\frac {1}{R}}={\frac {1}{R_{1}}}+{\frac {1}{R_{2}}}+{\frac {1}{R_{3}}}+.....$

__Resistivity__

$\rho ={\frac {RA}{l}}$

$P=IV={\frac {V^{2}}{R}}$

__Induced EMF__

$\epsilon ={\frac {E}{Q}}$

$\epsilon =I(R+r)$

__Alternating current__

$I_{rms}={\frac {I_{peak}}{\sqrt {2}}}$

$V_{rms}={\frac {V_{peak}}{\sqrt {2}}}$