In a series circuit with a total current of 3 amps and resistances of 5 ohms and 2 ohms, what is the total voltage?

To determine the total voltage in a series circuit, you can use Ohm's Law, which states that voltage (V) is equal to the current (I) multiplied by the total resistance (R). In this case, you already have the total current, which is 3 amps.

First, calculate the total resistance by adding the individual resistances together. The resistances given are 5 ohms and 2 ohms:

Total Resistance = 5 ohms + 2 ohms = 7 ohms.

Now, applying Ohm's Law:

Total Voltage = Current × Total Resistance

Total Voltage = 3 amps × 7 ohms

Total Voltage = 21 volts.

This correctly reflects the relationship between voltage, current, and resistance in the circuit. Hence, the total voltage in the series circuit is 21 volts.