Final answer:
In a circuit, resistance decreases due to increased temperature from a short circuit, affecting power dissipation and ionization.
Explanation:
Resistance decreases in a circuit due to an increase in temperature caused by a short circuit. When ionization occurs, charged particles moving freely lower the resistance, as per Ohm's Law where power (P) = Voltage (V)2/Resistance (R). This process can lead to a rise in power dissipation, causing further ionization and power production.
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