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Power Dissipated by Resistor Calculator Online

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The Power Dissipated by Resistor Calculator helps you determine how much power a resistor uses in an electrical circuit. This calculation is important to ensure that resistors do not overheat and damage the circuit. By using this calculator, you can quickly find out the power dissipation and keep your electronic components safe and reliable.

Formula of Power Dissipated by Resistor Calculator

To calculate the power dissipated by a resistor, you can use one of the following formulas based on the information you have:

Formula 1:

P = V^2 / R

Where:

  • P is the power in watts (W)
  • V is the voltage in volts (V)
  • R is the resistance in ohms (Ω)
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Formula 2:

P = I^2 * R

Where:

  • P is the power in watts (W)
  • I is the current in amperes (A)
  • R is the resistance in ohms (Ω)

These formulas help you calculate power dissipation using either voltage or current measurements.

Pre-calculated Values Table

For quick reference, the following table shows pre-calculated power dissipation values for common resistor values and standard voltage levels. This can save time and provide immediate insights without manual calculations.

Voltage (V)Resistance (Ω)Power Dissipation (W)
51000.25
121001.44
242202.62
52200.11
123300.44
244701.22

This table offers a quick reference for commonly used values in various applications.

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Example of Power Dissipated by Resistor Calculator

Let's go through an example to demonstrate how to use the Power Dissipated by Resistor Calculator.

Example: You have a resistor with a resistance of 100 ohms, and the voltage across it is 12 volts. Using Formula 1:

P = 12^2 / 100

P = 144 / 100 = 1.44 W

So, the power dissipated by the resistor is 1.44 watts.

Most Common FAQs

What is power dissipation in resistors?

Power dissipation in resistors refers to the process by which electrical energy is converted into heat energy as current flows through the resistor. This is an inherent characteristic of resistors and is a key factor in designing and selecting resistors for circuits.

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Why is it important to calculate power dissipation?

Calculating power dissipation is important to ensure that resistors are used within their rated power limits. Exceeding these limits can cause resistors to overheat, potentially leading to failure and damage to the circuit. Proper calculation helps in designing safe and efficient electronic systems.

Can this calculator be used for any type of resistor?

Yes, the Power Dissipated by Resistor Calculator can be used for any type of resistor, regardless of its material or construction. The key factors are the resistance value, the voltage across the resistor, and the current through it.

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