An ideal operational amplifier (op-amp) is connected to a load resistor. The op-amp is assumed to have infinite bandwidth and zero output resistance. State:
what is meant by infinite bandwidth
the effect, if any, on the output voltage of increasing the load resistance.
A student designs the circuit shown in the figure below in order to indicate changes in the temperature of the thermistor T.
Calculate the potential at point Q.
At a temperature of 
, the resistance of the thermistor T is 
. Show that the potential difference measured with the voltmeter is 
.
The resistance of the thermistor T in (b) decreases as its temperature rises. Explain the effect of this change in temperature on the potential difference measured with the voltmeter.
.
