Electric circuits

electric circuit

A _____ is an interconnection of electrical elements.

Charge

____ is an electrical property of the atomic particles of which matter consists, measured in Coulombs

direct current

It is a current that remains constant with time.

alternating current

It is a current that varies sinusoidally with time.

dependent source

A source whose output varies depending on another circuit variable is:

the element absorbs power

In the passive sign convention, positive power means

D. A resistor converts electrical energy into heat

Which of the following statements is TRUE regarding

resistors?

A. A resistor allows current to flow with no

voltage drop

B. A resistor stores electrical energy

C. A resistor amplifies electric signals

D. A resistor converts electrical energy into heat

C. Temperature coefficient

What is the advantage of a 6-band resistor?

A. Tolerance

B. Multiplier

C. Temperature coefficient

D. None of the mentioned

C. A switch is closed

Current flows in a circuit when

A. There is no voltage

B. The switch is either open or closed

C. A switch is closed

D. A switch is opened

BRANC

represents any two-terminal element. The number of ___ in a circuit is equal to the number of elements.

node

is the point of interconnection between two or more branches.

loop

is any closed path in a circuit. A loop is said to be independent if it contains a branch which is not in any other loop.

B. Increases

When one of three series resistors is removed from a

circuit and the circuit is reconnected, the current

A. Increases by one - third

B. Increases

C. Decreases by one - third

D. Decreases by the amount of current through the removed resistor

D. The remaining two will glow with the same brightness as before

Three lights are connected in parallel across a 120 volt

source. If one light burns out,

A. The remaining two will glow dimmer

B. The remaining two will glow brighter

C. The remaining two will not light

D. The remaining two will glow with the same brightness as before

ac circuits

Circuits driven by sinusoidal current or voltage sources are called

effective value

This is the value of alternating voltage or current that will have the same effect on a resistance as a comparable value of direct voltage or current will have on the same resistance:

reactance

It is the opposition to the flow of current introduce by a capacitor and/or an inductor.

impedance

It is the total opposition to the flow of alternating current.

Reactive power

The term used for an out of phase non-productive power associated with inductors and capacitors.

unity

What is the power factor of a series RLC circuit under resonance condition?

It becomes capacitive

What will happen to a series ac circuit if its line frequency is less than the resonant frequency?

Lags the applied voltage

In a series RLC circuit that is operating above the resonant frequency, the current:

Leads the applied voltage

In a parallel RLC circuit that is operating above the resonant frequency, the current

above

The current lags the supply voltage in a series RLC circuit has its frequency ______ the resonant frequency.

minimum, maximum

At series resonance, the impedance and current of the circuit is _______ and _______, respectively.

A larger bandwidth

In a series resonant circuit bandpass filter, a lower vale of Q results in