The correct formula for determining the total power consumption of the circuit when E (volts) and I (amps) are known is PT = ET × IT.

The correct formula for determining the total power consumption of the circuit when E (volts) and I (amps) are known is PT = ET × IT.

• A. PT = ET2 × IT
• B. PT = ET × IT
• C. Pt = Et/ It
• D. PT = IT2 × RT

Answer: (B)

Power is the rate at which energy is transferred, and in a DC circuit it equals the product of the voltage across the circuit and the current flowing through it. So when the voltage is known as E and the current as I, the total power consumed is PT = ET × IT, giving power in watts. This reflects that voltage provides the energy per charge and current provides how many charges move per second; together they quantify energy flow per second. Other forms would require additional quantities (like resistance) or modify the operation (such as squaring voltage), so they don’t express the total power directly in terms of voltage and current.

Power is the rate at which energy is transferred, and in a DC circuit it equals the product of the voltage across the circuit and the current flowing through it. So when the voltage is known as E and the current as I, the total power consumed is PT = ET × IT, giving power in watts. This reflects that voltage provides the energy per charge and current provides how many charges move per second; together they quantify energy flow per second. Other forms would require additional quantities (like resistance) or modify the operation (such as squaring voltage), so they don’t express the total power directly in terms of voltage and current.