1
Q
Formula for resistance of a wire
A
R = resistivity * length / area
2
Q
What happens when an A.C is passed through a piezo electric crystal
A
It stretches and squeezes creating sound
3
Q
For a metal wire strain gauge what is the relationship between stretch and resistance
A
Proportional
4
Q
5 properties of Op-amp
A
Input impedance, Open loop gain, Bandwidth and Slew rate
Zero output impedance
5
Q
Gain of non-inverting amplifier
A
-R1/Rin where R1 is a negative feedback resistor
6
Q
Gain of inverting amplifier
A
1 + R2/R1
A level Physics
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