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The voltage across a semiconductor diode (and across the base/emitter junction of a transistor) decreases as temperature increases:  the actual figure is -2mV/°C.

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13y ago

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Does the current ina circuit increase with increase in temperature?

Resistance increases as temperature increases. If Voltage is held constant then according to Ohm's Law Voltage = Current x Resistance then current would decrease as resistance increases.


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Inversely. As resistance increases, current dereases; given that the applied voltage is constant.


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If voltage increases when current remains constant then resistance must also increase. Ohm's Law: Voltage = Current times Resistance.


What happens to the voltage if the current increases?

Yes, if the resistance remains constant. Power is voltage times current, and current is voltage divided by resistance, so power is voltage squared divided by resistance. In essence, the power increases as the square of the voltage.


What is the effect of temperature on ohms law?

AnswerOne of the conditions for Ohm's Law to apply is that the temperature of a conductor MUST remain constant. And, unfortunately, this is difficult to achieve because as the applied voltage increases, the resulting current causes the temperature of the conductor to rise -thus negating Ohm's Law!!For Ohm's Law to apply, the ratio of voltage to current must remain constant for variations in voltage. If it doesn't, then the conductor/device is NOT obeying Ohm's Law. Period! So if, for example, you increase the voltage across a lamp, you will find that the ratio varies as the voltage increases, and this is because the resistance is increasing due to an increase in temperature. So, in this example, the temperature is the reason why lamps don't obey Ohm's Law.


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Does increasing the resistance increase the electric current?

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