The circuit in the figure shows the effect of a barefooted person touching a live 280 V DC electric supply at A. The resistance through the body between the person’s wet hand and sole of foot is 20 k?(kila ohm) and between the sole of damp foot and the floor is 120 k?. The floor is effectively ‘earth’, connected to the lower side of the electricity supply. An electric device of 100 ohm resistance is also shown connected to the point A .
When the person touches point A:
a) what is the current through the 100 ohm device alone
b) what is the current ?
through the person alone
c) what is the electric power dissipated at the resistance between the sole-and-floor? ?
d) An AC power supply is now used to give the same mean power to the 100 ohm device as given by the 280 V DC supply. What is the rms voltage of this AC power supply?
When the person touches point A:
a) what is the current through the 100 ohm device alone
b) what is the current ?
through the person alone
c) what is the electric power dissipated at the resistance between the sole-and-floor? ?
d) An AC power supply is now used to give the same mean power to the 100 ohm device as given by the 280 V DC supply. What is the rms voltage of this AC power supply?