A human being can be electrocuted if a current as small as 50mA passes near the heart. An electrician working with sweaty hands makes good contact with the two conductors he is holding, one in each hand. If his resistance is , what might the fatal voltage be?
The value of the fatal voltage is 100V.
Ohm’s law states that the potential difference is directly proportional to the current and the constant of proportionality is called resistance.
We can find the fatal voltage by substituting the given values of the current and the resistance in the formula for Ohm’s law.
The voltage equation from Ohm’s law, V = lR …(i)
Here, V is the potential difference, l is current, R and is resistance.
Using the given data in equation (i), we can get the value of the fatal voltage as follows:
Therefore, the fatal voltage is 100V.
A linear accelerator produces a pulsed beam of electrons. The pulse current is 0.50 A, and the pulse duration is 0.10 ms. (a) How many electrons are accelerated per pulse? (b) What is the average current for a machine operating at 500 pulses/s ? If the electrons are accelerated to energy of 50 MeV, what are the (c) average power and (d) peak power of the accelerator?
Copper and aluminum are being considered for a high-voltage transmission line that must carry a current of 60.0 A. The resistance per unit length is to be . The densities of copper and aluminum are 8960 and , respectively. Compute (a) the magnitude J of the current density and (b) the mass per unit length for a copper cable and (c) J for an aluminum cable (d) for an aluminum cable.
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