Ohm's Law: Calculate the Applied Voltage

What is the voltage that must be applied in a circuit where a current of 9 A flows through a device with a resistance of 43 ohms?

A. 387 V
B. 4.8 A
C. 387 A
D. 4.8 V

Answer:

The correct answer is A. 387 V. Make sure not to mistakenly choose 387 A as the answer.

Ohm's law is a fundamental principle in electronics that relates voltage, current, and resistance in an electrical circuit. It states that the voltage across a device is equal to the product of the current flowing through it and its resistance.

In this particular case, where a current of 9 A is flowing through a device with a resistance of 43 ohms, we can use Ohm's law to calculate the applied voltage:

Voltage = Current x Resistance

Voltage = 9 A x 43 ohms

Voltage = 387 V

Therefore, the correct voltage that must be applied in this circuit is 387 volts. It is essential to understand and apply Ohm's law correctly to solve electrical problems accurately.