What is the current in a circuit with a resistance of 4.0 ohms and a voltage of 20 volts?

To calculate the current in a circuit, Ohm's Law is applied, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is 20 volts and the resistance is 4.0 ohms.

Using the formula:

I = V / R

I = 20 volts / 4.0 ohms

I = 5 amperes

This confirms that the current in the circuit is 5 amperes. This answer is derived from a straightforward application of the formula, ensuring that the relationship between voltage, current, and resistance is correctly understood and calculated.