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If the value of exponent in power law is equal to unity, then the conduction in composite is ohmic in nature and when the exponent is greater than unity, the conduction is non-ohmic. It is revealed that the value of exponent is greater than unity for the composite at temperature 25 K.
Ford et al., "Universality of non-Ohmic shunt leakage in thin-film solar cells," Journal of Applied Physics, vol.
Figure 2 shows the graph of these results both with an ohmic fit and with a non-ohmic fit.
Longo, "Sn[O.sub.2], ZnO and related polycrystalline compound semiconductors: an overview and review on the voltage-dependent resistance (non-ohmic) feature," Journal of the European Ceramic Society, vol.
A topic "I-V Current voltage characteristics for ohmic and non-ohmic conductors" is added in curriculum 2006 which is a logical change because it helps in drawing graphs for variable I-V to verify the characteristics of ohmic and non-ohmic substances.
Non-ohmic behavior in a-[Se.sub.8Q-x][Te.sub.20][Cd.sub.x] thin films, Materials Letters 60, 1640-1645.
Furthermore, according to Ohm's law, the resistance, R, is given by the ratio V/i, so we can show how the resistance varies with temperature, which reveals the non-Ohmic behavior of incandescent lamps.
The obtained m (2.00-2.072) values suggest that at lower voltages (region I), the conduction is ohmic, that is, the current changes linearly with voltage, whereas at higher voltages (region II), the conduction is the non-ohmic. In the first region, slope of lnI vs.
2) conductivity by means of barrier tunneling between particles which have no direct contact, 3) other, non-Ohmic types of conductivity processes, for example, space charge limited conductivity.
By taking into account that the carbon black particles are sources of charge carriers that move freely through the polymer chains, it can be suggested that the conduction process is non-ohmic (I = [kV.sup.n], with n = 1.07 to 1.4) and mainly owing to electronic movements or to electronic emission effects, as has been suggested by other authors [7].
log V indicates that in the low field region the slope is nearly equal to unity showing ohmic behavior, whereas in the high field region the behavior in non-ohmic having slope equal to 2.
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