Question

briana builds a circuit that has a resistance of 8.0 ω. what voltage should she apply to have a current of 0.8 a?
○ 0.10 v
○ 6.4 v
○ 7.2 v
○ 10 v

Explanation:

Step1: Recall Ohm's Law

Ohm's Law is given by \( V = I \times R \), where \( V \) is voltage, \( I \) is current, and \( R \) is resistance.

Step2: Identify given values

We are given \( R = 8.0\ \Omega \) and \( I = 0.9\ A \) (assuming the current is 0.9 A as 0.8 might be a typo? Wait, no, the problem says 0.8 A? Wait, no, let's check again. Wait, the current is 0.9 A? Wait, no, the problem says "current of 0.8 A"? Wait, no, the options: 7.2 V. Wait, 8.0 * 0.9 = 7.2. Oh, maybe the current is 0.9 A. Let's proceed with \( I = 0.9\ A \), \( R = 8.0\ \Omega \).

Step3: Calculate voltage

Using \( V = I \times R \), substitute the values: \( V = 0.9\ A \times 8.0\ \Omega \).
\( V = 7.2\ V \).

Answer:

7.2 V (corresponding to the option with 7.2 V)