Understanding RC Circuits and Phasor Diagrams

What is the phase relationship between voltage and current in a purely resistive circuit?

• Voltage leads current by 90 degrees

• Voltage and current are in phase

• Current leads voltage by 90 degrees

• Voltage lags current by 45 degrees

In a capacitive circuit, how does the current relate to the voltage?

• Current leads voltage by 90 degrees

• Voltage leads current by 45 degrees

• Current and voltage are in phase

• Current lags voltage by 90 degrees

How do you calculate the voltage of the source in an RC circuit using a phasor diagram?

• By adding the voltages across the resistor and capacitor directly

• By using the Pythagorean theorem on the phasor diagram

• By multiplying the voltages across the resistor and capacitor

• By subtracting the voltage across the capacitor from the resistor

What formula is used to calculate the current in an RC circuit?

• I = V / (R + XC)

• I = V * (R + XC)

• I = V * Z

• I = V / Z

What does the symbol Z represent in an RC circuit?

• Resistance

• Reactance

• Voltage

• Impedance

How is the phase angle in an RC circuit typically calculated?

• Using the cosine function

• Using the tangent function

• Using the sine function

• Using the cotangent function

What is the total opposition to electron flow in an AC circuit called?

• Reactance

• Conductance

• Impedance

• Resistance

In the impedance triangle, what does the hypotenuse represent?

• Impedance

• Voltage

• Reactance

• Resistance

What is the relationship between the phase angles of the voltage and impedance triangles in an RC circuit?

• One is double the other

• One is half the other

• They are the same

• They are different

Which component in an RC circuit has reactance but no resistance?

• Resistor

• Transformer

• Capacitor

• Inductor