Changes

Unlike the current transformer (previously) which can only sense AC amps, the Hall Effect sensor can also sense DC amps. It does this by measuring the magnetic field that a current creates.

Unlike the current transformer (previously) which can only sense AC amps, the Hall Effect sensor can also sense DC amps. It does this by measuring the magnetic field that a current creates.

[[File:Amperes law.png]] http://en.wikipedia.org/wiki/Amp%C3%A8re%27s_circuital_law

[[File:Amperes law.png]]     http://en.wikipedia.org/wiki/Amp%C3%A8re%27s_circuital_law

*μ0 = 4π×10−7 N·A−2  

*μ0 = 4π×10^−7 N·A−2  

*B in tesla (1 gauss = 10^-4 tesla)

*B in tesla (1 gauss = 10^-4 tesla)

*l in metres

*l in metres

*i in amps

*i in amps

and in the case of the magnetic field B at a radius r from a wire, the left side integral evaluates to B2πr

and in the special case of the magnetic field B at a radius r from a wire in free space, the left side integral evaluates to B2πr and at a radius if 1cm from a wire carrying 1 amp , the field is 4π10^-7/2π10^-2 = 2x10^-5 tesla or 2x10^-1 gauss

==Links==

==Links==