Question
____ are insulators placed between the plates of a capacitor.
Answer
Dielectric materials are insulators placed between the plates of a capacitor.
Note: In Fig. 26.16a, ammeter A reads the current I in the resistor R. Voltmeter V, however, reads the sum of the potential difference Vab across the resistor and the potential difference Vbc across the ammeter. If we transfer the voltmeter terminal from c to b, as in Fig. 26.16b, then the voltmeter reads the potential difference Vab correctly, but the ammeter now reads the sum of the current I in the resistor and the current IV in the voltmeter. Either way, we have to correct the reading of one instrument or the other unless the corrections are small enough to be negligible.
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Conductivity can be divided into two categories: ____ conductivity.
Conductance is the reciprocal of ____.
The SI unit for conductance is ____.
Some materials allow free flow of electric charge within them; these materials are called ____.
The ____ has often been visualized as a sea of electrons flowing over and past a rigid lattice of metal cations.
Due to ____, electrons are free to move around in the metal, conducting electrical charges.