The Jacana Technical Library

Electrical

 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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