A student connects a circuit with an NTC thermistor, a filament lamp and a battery in series. The lamp glows dimly. The student warms the thermistor with a hair dryer. What change will the student notice in the brightness of the lamp? Explain your answer

 

The resistance of a metal wire changes with temperature. This means that a wire could be used to sense changes in temperature, in the same way that a thermistor is used 

 Suggest one advantage a thermistor has over a metal wire for this purpose.

The resistance of a metal wire changes with temperature. This means that a wire could be used to sense changes in temperature, in the same way that a thermistor is used.

Suggest one advantage a metal wire has over a thermistor.

Use the resistivity value quoted in given table. Calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances of: $1.0\Omega$ .

Use the resistivity value quoted in given table. To calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances$5.0\Omega$.

Use the resistivity value quoted in given table to calculate the lengths of 0.50mm diameter manganin wire needed to make resistance coils with resistances of:

$10\Omega$.

$1.0c{m}^3$Of copper is drawn out into the form of a long wire of cross-sectional area $4.0\times {10}^{-7}{m}^2$. Calculate its resistance. (Use the resistivity value for copper from Table)

A $1.0m$, length of copper wire has a resistance of $0.50\Omega$, then calculate the resistance of a $50.m$, length of the same wire.

A$1.0m$ Length of copper wire has a resistance of $0.50\Omega .$ What will be the resistance of $1m$ length of copper wire having half the diameter of the original wire?