When 7.2 kilovolts is applied to a 2.4 kilohm resistor, how much current will flow through it?

• A. 2 A
• B. 3 A
• C. 4 A
• D. 5 A

Answer: (B)

To determine the current flowing through a resistor when a certain voltage is applied, Ohm's Law is used, which states that the current (I) is equal to the voltage (V) divided by the resistance (R). The formula can be expressed as:

[ I = \frac{V}{R} ]

In this scenario, the voltage given is 7.2 kilovolts (which is 7200 volts when converted) and the resistance is 2.4 kilohms (which is 2400 ohms when converted). Plugging these values into the formula gives us:

[ I = \frac{7200 , \text{volts}}{2400 , \text{ohms}} ]

Calculating this:

[ I = 3 , \text{A} ]

Thus, the current that flows through the resistor is 3 A. This reasoning aligns with the correct answer, providing a clear understanding of how to apply Ohm's Law to find the current in this electrical circuit scenario.