What is the formula for calculating power in an AC circuit?
Practice Questions
Q1
What is the formula for calculating power in an AC circuit?
P = V^2 / R
P = I^2 * R
P = V * I * cos(φ)
P = V / I
Questions & Step-by-Step Solutions
What is the formula for calculating power in an AC circuit?
Correct Answer: P = V * I * cos(φ)
Step 1: Identify the voltage (V) in the AC circuit. This is the electrical potential difference measured in volts.
Step 2: Identify the current (I) flowing through the circuit. This is the flow of electric charge measured in amperes.
Step 3: Determine the phase angle (φ) between the voltage and current. This angle shows how much the current is out of sync with the voltage, measured in degrees or radians.
Step 4: Calculate the cosine of the phase angle (cos(φ)). This value helps to find the real power in the circuit.
Step 5: Use the formula P = V * I * cos(φ) to calculate the real power (P) in watts.
