Peak Voltage Formula

Answer: B. 26 V

Peak voltage is 26.0 V

Solution:

Given, 

rms voltage across resistor V_R=12 V

rms Voltage across inductor V_L=14 V

In series RL circuit source voltage V_S=V_R∠0°+V_L∠90°

V_S=V_R+jV_L

Magnitude of V_S=√(V_R²+V_L²)

V_S=√[(12)²+(14)²]=√340 rms

Above determined value of source voltage is rms value.

Peak voltage of source V_S,p=√2.Vrms=√(2×340)=26.076 Volts

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