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Resistance of copper and aluminium windings with rise of temperature
\[\text R_{2} / R_{1}=\left(\theta_{2}-\theta_{0}\right) /\left(\theta_{1}-\theta_{0}\right)\]
Resistance of copper and aluminium windings with rise of temperature
\[\Delta R_{pu}=\left(R_{2}-R_{1}\right) / R_{1}=\Delta \theta /\left(\theta_{1}-\theta_{0}\right)\]
Resistance of copper and aluminium windings with rise of temperature
\[\Delta R_{pu}=\left(R_{2}-R_{1}\right) / R_{1}=\Delta \theta /\left(\theta_{1}-\theta_{0}\right)\]
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