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# Calculator Friendly Formulas

This is the AQA version closing after June 2019. Visit the the version for Eduqas instead.

This page shows how formulas match calculator key presses. On different models of calculator you will find which is the same as .

### Calculator Key Presses

Ohm's Law
R = V / I        12 V / 10mA V I 12 10  3 V = I R        22mA x 3.3kΩ I R 22  3 3.3 3 I = V / R        12 / 22kΩ V R 12 22 3 Power Calculations
P = I V        10mA x 7V I V 10  3 7 P = I2 R        10mA2 x 100Ω I  R 10 2  100 P = V2 / R        122 / 8 V  R 12  8 P = VRMS2 / R        (12 x 0.7)2 / 8 V  R  12 0.7   8 Parallel Resistors / Series Capacitors
1 / Rt = 1/R1 + 1/R2 1  1 R1 1 R2  Voltage Divider
Vout = Vs R2 / (R1 + R2) Vs R2  R1 R2  Amplifier Gain
Gv = Vout / Vin Vout Vin Astable Frequency
F = 1.44 / ((Ra + 2Rb) C1) 1.44   Ra 2 Rb  C1  F = 1.44 / ((10K+ 2 x 100K) x 5nF) 1.44   10 3 2 100 3  5  9  reviseOmatic V3     Contacts, ©, Cookies, Data Protection and Disclaimers Hosted at linode.com, London