What is the current through a resistor of 20.0 ohms if the voltage is 6.0 volts?

• A. 0.20 amperes
• B. 0.30 amperes
• C. 0.40 amperes
• D. 0.50 amperes

Answer: (B)

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

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

In this case, the voltage is 6.0 volts and the resistance is 20.0 ohms. Plugging these values into the formula, you get:

[ I = \frac{6.0 \text{ volts}}{20.0 \text{ ohms}} ]

This calculation yields:

[ I = 0.30 \text{ amperes} ]

This result indicates that the current through the 20-ohm resistor when subjected to a 6-volt source is 0.30 amperes. Therefore, this choice reflects the application of Ohm's Law correctly, leading to the accurate determination of current in an electrical circuit.