Which of the follows are not true? For human, AC current is safer than DC curren

Question

Which of the follows are not true?

For human, AC current is safer than DC current in term of electric shock at the same power.

Skin impedance presents the largest impedance in the noninvasive recording of biopotential.

To reduce skin impedance, we can use wet electrode or sand a layer of epidermis.

By measuring the body impedance, we can have the idea of the person's hydration status, the fat ratio et

For human, AC current is safer than DC current in term of electric shock at the same power.

Skin impedance presents the largest impedance in the noninvasive recording of biopotential.

To reduce skin impedance, we can use wet electrode or sand a layer of epidermis.

By measuring the body impedance, we can have the idea of the person's hydration status, the fat ratio et

Explanation / Answer

a is not true becaus of more DC current is required to induce the same harmful effects as AC current.

Alternating current (AC) and Direct current (DC) have slightly different effects on the human body, but both are dangerous above a certain voltage. To produce the same power in human body, the magnitude of DC flow of constant strength shall be two to four times greater than that of the AC. i.e more DC current is required to induce the same harmful effects as AC current.

b is true Biopotential electrodes are crucial in monitoring ECG, EMG, etc., signals. Applying the right type of electrode that lasts for a long time and assists in recording high signal quality is desirable in medical devices industry. thats way Skin impedance presents the largest impedance in the noninvasive recording of biopotential.

C is true In regard to the skin impedance two practical methods are used to reduce the effect of epidermis: abrading the stratum corneum with find sandpaper or rubbing with a pad soaked in acetone. Surface electrodes are widely used in the measurement of skin impedance, such as ECG, EEG or EMG. The electrodes are able to operate in both wet and dry conditions

D is true Why because of actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to calculate an estimate of total body water (TBW). TBW can be used to estimate fat-free body mass and, by difference with body weight, body fat.

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