State Kirchhoff’s first law for a junction.
The thermistor has resistance $R_0$ at a temperature of $0^\circ\text{C}$. On Fig. 5.2, sketch a possible graph showing how the resistance of the thermistor changes with temperature from $0^\circ\text{C}$ to $100^\circ\text{C}$.
With reference to the current in the cell, explain why the current in resistor R decreases as the thermistor temperature rises.
The electromotive force (e.m.f.) $E$ of the cell in Fig. 5.1 is $1.50\,\text{V}$. The internal resistance $r$ of the cell is $0.12\,\Omega$. Resistor R has a resistance of $6.00\,\Omega$. When the thermistor is at a particular temperature, the current in R is $0.200\,\text{A}$. For this thermistor temperature, determine the current in the cell.
The electromotive force (e.m.f.) $E$ of the cell in Fig. 5.1 is $1.50\,\text{V}$. The internal resistance $r$ of the cell is $0.12\,\Omega$. Resistor R has a resistance of $6.00\,\Omega$. When the thermistor is at a particular temperature, the current in R is $0.200\,\text{A}$. For this thermistor temperature, determine the resistance of the thermistor.