A current flowing through you of more than 5 ma is

Subject: Physics    / General Physics
Question

1.A current flowing through you of more than 5 ma is considered dangerous.

Why do we see warnings about high voltage, rather than high current?

What voltages are dangerous even if the skin is dry? (Dry skin has a resistance of 100 kohms while wet skin can be much less.)

An electroencephalogram (EEG) is a recording of differences in voltage observed on the scalp by attaching electrical contacts. If voltage differences that are observed are about 0.5 mv, and the resistance of the skin is about 10 kohms, what size currents are involved?

2.Suppose you fall from a building and on the way down you grab a high voltage wire. Assuming that the wire holds you, will you be electrocuted? If the wire breaks, should you continue to hold on as you fall?

3 How do you know that homes are not wired in series?

Are the two headlights of a car in series or parallel?

Are fuses put in parallel or in series with devices they are meant to protect? Why is it unsafe to replace a fuse that keeps burning out with one which has a higher amp rating?

A bulb and pair of batteries might have the batteries connected to each other in series or parallel. What are the advantages of each arrangement?