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Which one of the following equations could be used to calculate the power absorbed by a resistor?
Wiki User
∙ 14y ago
p=I*I*R ,
P=V*V/R;
where I is the current passing through the resistor, and V is the voltage across resistor, and R is the Resistance of the resistor,
Wiki User
∙ 14y ago
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What is the formula of power being dissipated in a resistor?
Voltage times current. You obtain current from the division of voltage and resistance, so: I[A] = U[V] / R[ohm] and P[W] = U[V] * I[A] it follows, that P[W] = U[V] * (U[V] / R[ohm]) = U[V] ^ 2 * R[ohm] So, voltage squared divided by resistance will give you the power that will be dissipated in a resistor. Whether the resistor will take that abuse is up to its power dissipation rating, however.
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Based on Ohm's Law, V = I*R, you would need to know the resistance along with one other parameter or the equation cannot be solved. However, if you are able to develop a set of independent linear equations based on the rest of the system surrounding that resistor using Kirchoff's Voltage Law or Kirchoff's Current Law, then you may still be able to solve for the unknown in the system.
