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Ohm's law basically states that the amount of current in a circuit varies directly with the voltage and varies inversely with the resistance
OHM'S LAW EQUATIONS
OHMS
VOLTS ÷ AMPERES
VOLTS ² ÷ WATTS
WATTS ÷ AMPERES ²
VOLTS
SQRT ( WATTS × OHMS )
WATTS ÷ AMPERES
AMPERES × OHMS
AMPS
VOLTS ÷ OHMS
WATTS ÷ VOLTS
SQRT ( WATTS ÷ OHMS )
WATTS
VOLTS ² ÷ OHMS
AMPS ² × OHMS
VOLTS × AMPS
Example #1, if you wish to find the watts ( W ) of a circuit and you know the voltage ( E ) is 12 volts and the amperage ( I ) is 4 amps substitute the numbers into the equation:
W = E × I ..... W = 12 × 4 ...... 48 watts
Example #2, if you wish to find the amperage ( I ) of a circuit and you know the voltage ( E ) is 12 volts and the wattage ( W ) is 200 watts substitute the numbers into the equation:
I = W ÷ E ..... I = 200 ÷ 12 ...... 16.66 amps
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