What is the formula for calculating the total power in a resistive AC circuit?
Correct Answer: P = V * I * cos(φ)
- Step 1: Understand that in a resistive AC circuit, power is the energy used over time.
- Step 2: Identify the variables in the formula: V is the voltage, I is the current, and φ (phi) is the phase angle.
- Step 3: Recognize that in a purely resistive circuit, the phase angle φ is 0 degrees, which means cos(φ) equals 1.
- Step 4: Write the simplified formula for total power in a resistive AC circuit: P = V * I.
- Step 5: To find the total power, multiply the voltage (V) by the current (I).
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