Power = Current * Voltage
P = I*V
therefore for the same power, when the current decreases, the voltage increases
this is the concept that is used in Transformers for power transmission (increasing the voltage and reducing current to reduce power loss in transmission lines).
actually according to ohm's law at a constant temperature I directly proportional to v. there by keeping a const. 1/R we get v=IR. RESISTANCE depends on the physical parameters. R=s L/A. when the voltage rises there exists a voltage difference which increases there by increases the temperature rise occures which agitates the molecules of the resistor . this excitation causes the free movement of molecules which in turn increases the conduction and a fall in resistance..........
AnswerThe simple answer is that it is temperature change that affects resistance, not the increase in current itself.
The resistance of a conducting material (any material, come to that) is affected by its length, cross-sectional area, and resistivity. As resistivity is affected by temperature, then resistance is indirectly affected by temperature -how much depends upon the type of material from which the conductor is manufactured.
For pure metal conductors, resistivity tends to increasewith temperature. So, if an increasing current flowing through such a conductor causes its temperature to rise, then its resistivity increases, causing its resistance to rise. For example, the resistance of the tungsten filament of an incandescent lamp increases quite markedly between its 'cold' temperature and its 'hot' (operating) temperature.
Some alloys are manufactured so that their resistivity (and, therefore, their resistance) remains constant over a wide range of temperature variations. The resistivity of insulators, on the other hand, falls with an increase in temperature, causing their resistance to fall with an increase in temperature -in fact, a high temperature is the major cause of insulation failure.
capacitors
current decreases and resistance increases
Ohm's law states that "The current is directly proportional to the applied EMF (voltage) and inversely proportional to the resistance in the circuit." <<>> if resistor exists, resistance decreases according to ohm's law, current is directly proportional to voltage and current is inversely proportional to resistance it means as current increases, voltage increases. resistance increases, current decreases so as voltage if there is no resistor, there should be no resistance except internal resistance of voltmeter and ammeter
Because Beta (current gain) in a transistor is inversely proportional to frequency. Hence it increases as frequency decreases. Also the ac voltage gain is directly proportional to Beta.
we know that frequency and time period are inversely proportional so as frequency decreases time period increases resulting in larger current flow thus increasing the dissipation.
increases
it increases
Increases the total resistance
Ohm's Law says that Voltage = Current x Resistance (Load). Therefore Current = Voltage / Resistance and as resistance decreases current increases and as resistance increases current decreases.
As the number of bulbs in a series circuit increases, the current decreases. As the number of bulbs in a parallel circuit increases, the current increases.
Current increases if the voltage remains constant.
TRANSFORMER
capacitors
Based on the simplest Electrical Equation V = I * R,(reads: voltage equals current multiplied by resistance)then, rearranged I = V / R .As resistance decreases, current flow proportionately increases
Ohm's Law Voltage = Current x Resistance. So for a fixed voltage as R decreases then current increases proportionally.
current decreases and resistance increases
Ohm's law says the opposite.