Which formula is used to calculate current in a circuit?

Which formula is used to calculate current in a circuit?

• A. I = E + R
• B. I = P / E
• C. I = E / R
• D. I = R / P

Answer: (C)

The formula used to calculate current in a circuit is I = E / R, where "I" represents the current in amperes, "E" is the voltage in volts, and "R" is the resistance in ohms. This formula is derived from Ohm's Law, which establishes the relationship between current, voltage, and resistance in an electrical circuit. According to Ohm's Law, the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Therefore, if you know the voltage supplied to a circuit and the resistance of the circuit, you can easily solve for the current. This fundamental relationship is vital in both basic circuit analysis and practical applications in electronics and ham radio operations. The other provided formulas do not correctly represent this relationship. For instance, the formula that suggests adding voltage and resistance does not conform to any of the standard electrical laws. The formula that derives from power (P) and voltage (E) would apply specific conditions, and similarly, the formula suggesting resistance divided by power does not have a direct application to calculate current accurately. Understanding Ohm’s Law and recognizing its correct application is crucial for anyone studying or working with electrical circuits

The formula used to calculate current in a circuit is I = E / R, where "I" represents the current in amperes, "E" is the voltage in volts, and "R" is the resistance in ohms. This formula is derived from Ohm's Law, which establishes the relationship between current, voltage, and resistance in an electrical circuit.

According to Ohm's Law, the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. Therefore, if you know the voltage supplied to a circuit and the resistance of the circuit, you can easily solve for the current. This fundamental relationship is vital in both basic circuit analysis and practical applications in electronics and ham radio operations.

The other provided formulas do not correctly represent this relationship. For instance, the formula that suggests adding voltage and resistance does not conform to any of the standard electrical laws. The formula that derives from power (P) and voltage (E) would apply specific conditions, and similarly, the formula suggesting resistance divided by power does not have a direct application to calculate current accurately. Understanding Ohm’s Law and recognizing its correct application is crucial for anyone studying or working with electrical circuits