Practice # 7 Capacitance, Inductance and Impedance

Front

Doubling the number of turns in a coil produces a field __________ if the same current is used.

Back

twice as strong

Front

Inductive reactance and capacitive reactance may create a __________ between the voltage and current in an AC circuit.

Back

phase shift

Front

By definition, one __________ is one coulomb of charge stored with one volt across the plates of the capacitor.

Back

farad

Front

The __________ is the basic unit of inductance and is symbolized with the letter H.

Back

Henry

Front

In a circuit containing only capacitance, the current reaches its maximum value ahead of the voltage and the current leads the voltage by 90°.

Back

True

Front

What is the relationship between inductance and the number of turns in a coil?

Back

Increasing the number of turns increases the inductance.

Front

What is the formula for capacitive reactance (Xc)?

Back

Xc = 1 / (2πfC), where f is frequency and C is capacitance.

Front

What is the unit of impedance in an AC circuit?

Back

Ohm (Ω)

Front

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

Back

Voltage and current are in phase.

Front

What is the effect of increasing frequency on inductive reactance?

Back

Inductive reactance increases with frequency.