Voltage can be calculated by:

Voltage can be calculated by:

• A. V = E / I
• B. V = I x R
• C. V = R / I
• D. V = E x I

Answer: (B)

Voltage is determined by how much current flows and how much opposition (resistance) there is. Ohm's law captures this relationship with V = I × R. This means the voltage across a component equals the current through it times its resistance. The units line up properly: current in amperes times resistance in ohms gives volts. Think of it this way: if 2 amps flow through a 5-ohm resistor, the voltage across it is 10 volts. If you double the current while keeping resistance the same, the voltage doubles; if you increase resistance with the same current, the voltage increases proportionally. Other forms don’t fit the relationship described by Ohm's law. Dividing something by current or multiplying by an energy term doesn’t consistently yield voltage for a resistive element, and would not produce the correct units or behavior.

Voltage is determined by how much current flows and how much opposition (resistance) there is. Ohm's law captures this relationship with V = I × R. This means the voltage across a component equals the current through it times its resistance. The units line up properly: current in amperes times resistance in ohms gives volts.

Think of it this way: if 2 amps flow through a 5-ohm resistor, the voltage across it is 10 volts. If you double the current while keeping resistance the same, the voltage doubles; if you increase resistance with the same current, the voltage increases proportionally.

Other forms don’t fit the relationship described by Ohm's law. Dividing something by current or multiplying by an energy term doesn’t consistently yield voltage for a resistive element, and would not produce the correct units or behavior.