Fird the current through. person and identify the likely effect on herd she touc

Question

Fird the current through. person and identify the likely effect on herd she touches 120 V AC source in the following circumstances. (Note that currents above 10 mA lead to (a) Find the current Oin mA) if she is standing on a rubber mat and offers a total resistance of 400 kQ. Idenlily the ikely effect. 0 She w expertence muscle contraction Ser the dration of the shock. She wil feel nething (b) Find the errent (in mA) i she is standing barefost on wet grass and has resistance of only 4100 0 She wil experience muscle centraction for the duration of the sheck She will feal nothing

Explanation / Answer

a) I = V / R

= 120 / (400 * 103)

current = 0.3 mA

she will feel nothing

b)  I = V / R

= 120 / (4100)

= 0.02926 A = 29.26 mA

she will experience muscle contraction for the duration of shock

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