Electricity sem 2, test 1

通報

問題一覧

______ is the current flow that continually changes its value and periodically reverses direction

Alternating current

The waveform of alternating current produced by a rotating generator is called a ____ wave.

Sine

How many advantages does A/C have over D/C? What are they?

Two advantages, •easy to produce •can be stepped up or stepped down

In North America standard household AC is ____V @ ____ hz

115V 400hz

The time required for one cycle of a sine wave to be completed is called the ____?

Period

The number of complete cycles of a sine wave per second is the ____ A/C and is expressed in ____.

Frequency, Hertz

Voltage used to compare heat from A/C circuits to heat from D/C circuits is called _____?

Effective voltage / Vrms

Another name for the RMS value of A/C is the _____ value?

Effective value

The RMS value of A/C is ____ times the peak volume

Vrms = 0.707 x Vp

In an A/C circuit the product of the voltage and current is the _____ and is expressed in _____.

Apparent power, Volt amps

A purely resistive circuit has the maximum power factor of _____?

If we know the power factor we can calculate the _____ by using ___?

Phase angle, Cos theta

______ frequency is the frequency when inductive reactance and capacitive reactance are the same.

Resonance

RLC circuits have elements of ?

•resistance •inductive reactance •capacitive reactance

Capacitors in parallel are added like resistors in ____?

Series

Capacitors in series are added like resistors in _____?

Parallel

Inductors in series are added like resistors in____?

Series

The three factors that affect a capacitors capacitance are?

•plate area •distance between plates •material of the dielectric

The four factors that affect an inductors inductance are?

•type of core material •number of turns in a coil •shape of the coil •wire gauge

An inductor store energy in a ____ field, while a capacitor stores energy in a ____field

Magnetic, electrostatic

An inductor resists charges in _____, while a capacitor resists changes in _____?

Current, voltage

Since capacitors resist charges in voltage, ____ leads _____?

Current, voltage

Since inductors resist changes in current, _____ leads _____?

Voltage, current

The time it takes a capacitor to charge to 63.2% is known as the _____. It is calculated by _____?

Time constant, TC= R x C

After 1TC we can say that a capacitor is charged to ____% of the source voltage

63.2

Transformers are typically either ____ or ____?

Step up, step down

What type of transformer do we have if the input voltage is lower than the output voltage?

Step-up

What does the term “coil turn ratio” mean?

Compares number of coil turns in the primary side to the number of turns in the secondary side to determine step-up or step-down ratio

In order to measure voltage across any component, the test instrument has to be connected in ___ with the component.

Parallel

In order to measure current through a circuit, the test instrument has to be placed in ____with the circuit.

Series

Referring to an oscilloscope the X-axis represents the _____, while the Y- axis represents the______?

•Time to determine period / frequency •amplitude to determine peak voltage / peak to peak voltage

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