Ohm's law


The above graph shows the current through a nichrome wire according to the voltage applied. If \(i=\si{200\ \milli\ampere}\) and \(v=\si{125\ \volt}\),) what is the resistance (in \(\Omega\)) of the nichrome wire?

It is known that the amount of current needed to flow through a human being in order to cause them to have ventricular fibrillation (heart attack) is about 100 mA.

What is the minimum voltage (in volts) that will cause a person who has a body resistance of \(1723\ \Omega\) to have ventricular fibrillation?

If a current \(I=0.9\text{ A}\) flows through a resistor \(R=7\ \Omega\) of length \(\Delta d=5\ \) m, what is the electric field strength inside the resistor?

In the circuit above, \(V=5\text{ V},\) \(R_1=1\ \Omega,\) \(R_2=6\ \Omega,\) and \(R_3=12\ \Omega.\) Find the current through \(R_1.\)

If \(I=1\text{ A}\) and \(R=8\ \Omega,\) what is the voltage of the battery?


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