Watlow Heater Catalog

Reference Data (SI Unit)

Equations

Ohm’s Law

V R

Volts Volts = Watts x Ohms

Amperes

WR

W I

Amperes = Volts Ohms

W R

Volts = Watts

Amperes

Amperes = Watts Volts Amperes = Watts Ohms

V I R W (Volts) (Amps) (Ohms) (Watts)

W V

Volts = Amperes x Ohms

IR

V I

VI

Ohms Ohms = Volts Amperes Ohms = Volts 2 Watts

Watts Watts = Volts 2 Ohms

W I 2

I 2 R

Watts = Amperes 2 x Ohms Watts = Volts x Amperes

2 V 2 W

2 V 2 R

Ohms = Watts

Amperes 2

) V 1 ( 3 Phase Amperes = Total Watts Volts x 1.732 Wattage varies directly as ratio of voltages squared W 2 = W 1 x V 2 2

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