Instrumentation: [Weekly Question] Week 27 of 2011: Electrical overload issues
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This post was last edited by narshi on 2012-12-1 17:12. Topic: Why do wires or electrical components heat up and are prone to burning when a large current flows through them? Answer: Since every conductor has resistance, when current flows through this resistance, it does work; the conversion of electrical energy into thermal energy occurs as a result of this work done by the current in the resistance. Therefore, a large current flowing through a conductor or electrical component generates a lot of heat, which can cause damage to the wire or electrical component.
This post was last edited by denghl on 2012-12-21 at 21:20. Since every conductor has resistance, when current flows through it, work is done by the current. The work done by the current in the resistor converts electrical energy into thermal energy; therefore, a large current flowing through a conductor or electronic component generates a lot of heat, which can cause damage to the wires or electrical components.
This post was last edited by denghl on 2012-12-21 at 21:21. Reply to 1#: After high-power electrical appliances are connected in Baghdad, the total power increases, and the current in the main circuit rises. Since the resistance of the wires remains constant, according to Joule’s law, more heat is generated by the wires over a certain period of time, causing the main circuit to heat up significantly.
This post was last edited by denghl on 2012-12-21 at 21:23. Reply 1#: Even wires in Baghdad have resistance values; when the voltage remains constant, the resistance of the wire stays fixed. The greater the power, the greater the current, and thus the wire heats up
This post was last edited by denghl on 2012-12-21 21:24 because P=IU
This post was last edited by denghl on 2012-12-21 at 21:26. Reply to 1# Baghdad: Since every conductor has resistance, when electric current flows through it, the current does work. The work done by the current in the resistor converts this electrical energy into heat energy; therefore, a large current flowing through a conductor or electronic component generates a lot of heat, which can cause damage to the wires or electrical components.
Current multiplied by voltage equals energy, and the form of energy can be transformed. Do you understand?
This post was last edited by denghl on 2012-12-21 at 21:29. Since every conductor has resistance, when current flows through it, work is done by the current. The work done by the current in the resistor converts electrical energy into thermal energy; therefore, a large current flowing through a conductor or electronic component generates a lot of heat, which can cause damage to the wires or electrical components.
Current thermal effect: current squared multiplied by resistance
This post was last edited by denghl on 2012-12-21 at 21:31. When a current greater than the rated value flows through a wire or component, the work done by the current is equal to voltage times current; the heat generated is equal to power times time, which in turn is equal to voltage times current times time. Therefore, the amount of heat generated by a wire or component per unit of time is higher than the rated value. If the current is very high or the duration is long, and the heat generated cannot be dissipated properly, the wire or component will get damaged
This post was last edited by denghl on 2012-12-21 at 21:33. When the resistance of the wire remains constant, an increase in current leads to increased heat generation in the wire, which can result in the wire breaking.