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What happens to the current flowing through a metal resistor when the voltage across is increased?
Wiki User
∙ 14y ago
When the voltage is increased across a metal film resistor, the current flow will also increase. Ohm's law states that the current flowing through a resistor is directly proportional to the voltage across that resistor.
I = V/R
Let us assume an initial voltage drop across a 4.99K ohm metal film resistor is 5V. The current flow through the resistor is calculated to be:
I = 5/4990
= 0.001 Amps or 1 mA
If that voltage were to say double to 10V:
I = 10/4990
= 0.002 Amps or 2 mA
Using these values it is also possible to calculate the power dissipated by the resistor.
P = I*V
= 0.002 * 10
= 0.02 Watts
This power calculation determines the minimum physical case size needed for the resistor to function within these conditions. Anything smaller, the resistor will fail.
Wiki User
∙ 14y ago
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