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实用公式

Useful Formulae

Note: Enter known values in the yellow fields to calculate the unknowns

Temperature:

ºF = (ºC*1.8) + 32 ºC =(ºF - 32)/1.8
Deg C Deg F Deg F Deg C
20.5 68.9 68.9 20.5
       
ºK = ºC + 273.15    
ºR = ºF + 459.67    

 

Ohms Law:

V = (I)*R    V = volts, I = current in amperes, R = resistance in ohms

Volts: 120 120 120
Amperes: 0.5 0.5 0.5
Resistance (ohms): 240 240 240

 

Power: 

P = V*(I)    P = Power in watts, V = voltage, I = current in amperes

P = (I)2*R    P = Power in watts, R = resistance in ohms, I = current in amperes

P = (V)2/R    P = Power in watts, V = voltage, R = resistance in ohms

Voltage: 120 120 120
Current, A: 0.25 0.25 0.25
Resistance, ohms: 480 480 480
Power, watts: 30 30 30

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