The Jacana Technical Library

Electrical

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 Electrical Formulas

 

Ohms Law (DC Current)

 

                     Voltage (volts)           Power (watts)

Current (amps) =  --------------------   =   -----------------

                    Resistance (ohms)         Voltage (volts)

 

 

                                    Power (watts)

Current (amps)  = Square root of  --------------------

                                   Resistance (ohms)

 

Voltage (volts) = Current (amps) x Resistance (ohms)

 

Voltage (volts) = Power (watts) / Current (amps)

 

Voltage (volts) = Square root of Power (watts) x Resistance (ohms)

 

Power (watts) = Current (amps)2 x Resistance (ohms)

 

Power (watts) = Voltage (volts) x Current (amps)

 

Power (watts) = Voltage (volts)2 / Resistance (ohms)

 

Resistance (ohms) = Voltage (volts) / Current (amps)

 

Resistance (ohms) = Power (watts) / Current (amps)2

 

 

Ohms Law (AC Current)

 

                     Voltage (volts)

Current (amps) =  --------------------

                    Impedance (ohms)

 

Voltage (volts) = Current (amps) x Impedence (ohms)

 

Impedence (ohms) = Voltage (volts) / Current (amps)

 

 

Frequency and Wavelength

 

Frequency (kilohertz) = 300,000 / wavelength (metres)

 

Frequency (megahertz) = 300 / wavelength (metres)

 

Wavelength (metres) = 300,000 / frequency (kilohertz)

 

Wavelength (metres) = 300 / frequency (megahertz)

 

 

 

 

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