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Calculator Friendly Formulas


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This page shows how formulas match calculator key presses. On different models of calculator you will find Calculator Exp Button which is the same as Calculator x 10 to the x button .

The Formula

Calculator Key Presses
Ohm's Law
R = V / I        12 V / 10mA V divide I Equals                12 divide 10 divide divide 3 Equals
V = I R        22mA x 3.3kΩ I divide R Equals                22 divide divide 3 divide 3.3 divide 3 Equals
I = V / R        12 / 22kΩ V divide R Equals                12 divide 22 divide 3 Equals
Power Calculations
P = I V        10mA x 7V I divide V Equals                 10 divide divide 3 divide 7 Equals
P = I2 R        10mA2 x 100Ω I Squared divide R Equals                10 divide 2 Squared divide 100 Equals
P = V2 / R        122 / 8 V Squared divide R Equals                12 Squared divide 8 Equals
P = VRMS2 / R        (12 x 0.7)2 / 8 V Squared divide R Equals                Equals 12 divide 0.7 Equals Squared divide 8 Equals
Parallel Resistors / Series Capacitors
1 / Rt = 1/R1 + 1/R2 1 divide Equals 1 divide R1 divide 1 divide R2 Equals Equals
Voltage Divider
Vout = Vs R2 / (R1 + R2) Vs divide R2 divide EqualsR1 divide R2Equals Equals
Amplifier Gain
Gv = Vout / Vin Vout divide Vin Equals
Astable Frequency
F = 1.44 / ((Ra + 2Rb) C1) 1.44 divide Equals EqualsRa divide 2 divide RbEquals divide C1Equals Equals
F = 1.44 / ((10K+ 2 x 100K) x 5nF) 1.44 divide Equals Equals 10 divide 3 divide 2 divide 100 divide 3 Equals divide 5 divide divide 9 Equals Equals

 

 

 

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