A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

• A. 10 watts
• B. 20 watts
• C. 0.025 watts
• D. 1.25 watts

Answer: (D)

To determine the power dissipation across a resistor, you can use the formula for electrical power, which is: \[ P = I^2 \times R \] Here, \( P \) is the power in watts, \( I \) is the current in amperes, and \( R \) is the resistance in ohms. In this situation, the given values are: - Resistance (\( R \)) = 20 ohms - Current (\( I \)) = 0.25 A Now, plug the values into the formula: \[ P = (0.25 \, \text{A})^2 \times 20 \, \text{ohms} \] \[ P = 0.0625 \, \text{A}^2 \times 20 \, \text{ohms} \] \[ P = 1.25 \, \text{watts} \] This calculation shows that a 20 ohm resistor with 0.25 A of current will dissipate 1.25 watts of power. This result aligns with the correct choice. Understanding this calculation is crucial for those studying for the Radiotelegraph Operator License, as power dissipation is a

To determine the power dissipation across a resistor, you can use the formula for electrical power, which is:

[ P = I^2 \times R ]

Here, ( P ) is the power in watts, ( I ) is the current in amperes, and ( R ) is the resistance in ohms.

In this situation, the given values are:

• Resistance (( R )) = 20 ohms

• Current (( I )) = 0.25 A

Now, plug the values into the formula:

[ P = (0.25 , \text{A})^2 \times 20 , \text{ohms} ]

[ P = 0.0625 , \text{A}^2 \times 20 , \text{ohms} ]

[ P = 1.25 , \text{watts} ]

This calculation shows that a 20 ohm resistor with 0.25 A of current will dissipate 1.25 watts of power. This result aligns with the correct choice.

Understanding this calculation is crucial for those studying for the Radiotelegraph Operator License, as power dissipation is a