# Calculating Applied Voltage in Electric Circuit

## A current of 9 A flows through an electric device with a resistance of 43 Ω. What must be the applied voltage in this particular circuit?

**A. 4.8 V**

**B. 4.8 A**

**C. 387 V**

**D. 387 A**

**Answer:**

387 volts

**Explanation:**

Ohm's law is used to relate voltage, current, and resistance.

The formula is as follows: V = I * R where: V is the applied voltage (measured in volts), I is the current flowing (measured in amperes), R is the resistance (measured in ohm).

In the given, we have: current (I) = 9 amperes, resistance (R) = 43 ohm.

Substitute with the givens in the above formula to get the voltage as follows: V = 9 * 43 = 387 volts.

Therefore, the applied voltage in this particular circuit is 387 volts.

The correct answer would be:

C. 387 V