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Electricity > Basic electricity > Flashcards

Basic electricity Flashcards

1
Q

What constitutes a capacitor

A

Two conductors separated by an insulator

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2
Q

What is the purpose of a capacitor

A

It stores electrical energy in electrostatic fields

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3
Q

Does a capacitor in AC circuit cause the current to lead or like the voltage

A

It causes the current to lead the voltage

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4
Q

What is the basic unit of capacitance

A

The farad

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5
Q

Why should a electrolytic capacitor not be used in an AC circuits

A

They are polarized. An electrolytic capacitor will pass current of one polarity, but will block currents of the opposite polarity.

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6
Q

What is meant by Inductance

A

The ability to store electrical energy in electromagnetic fields

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7
Q

What is the basic unit of inductance

A

The Henry

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8
Q

What is an example of an and inductor used in a magneto

A

The coil

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9
Q

Does an inductour in an AC circuit cause the current to lead or lag the voltage

A

It causes the current to lag behind the voltage

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10
Q

How can you find the polarity of an electromagnet

A

Hold the electromagnetic in your left hand with your fingers in circling the coil in the direction electrons flow( from negative to positive ). Your thumb will point to the north pole of the electromagnet

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11
Q

What is meant by impedance

A

The total opposition to the floor alternating current. It is the vector sum of resistance, capacitive reactance, and inductive reactance.

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12
Q

And what unit is in impedance measured in

A

In ohms.

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13
Q

What are the five sources of electrical energy

A

Magnetism, chemical energy, light, heat, and pressure.

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14
Q

What is the basic unit of power in the DC circuit?

A

The watt

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15
Q

What is meant by a megawatt

A

100,000 Watts.

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16
Q

What is the formula for power in a DC circuit

A

Power=(E)(I)

17
Q

What is the relationship between mechanical and electrical power

A

1 Horse Power = 746 Watts

18
Q

What is meant by true power in an AC circuit

A

The product of the circuit voltage and the current that is in phase with this voltage.

19
Q

And what unit is true power expressed

A

In Watts

20
Q

What is meant by a parent power in an

AC circuit

A

The product of the circuit voltage and the circuit current

21
Q

In what units is apparent power expressed

A

In volts – amps

22
Q

What is meant by reactive power in an AC circuit

A

The power consumed in the inductive and capacitive reactants is in an AC circuit. Reactive power is also called Wattless power.

23
Q

And what units is reactive power expressed

A

In vault – amps reactive, (VAR), or kilowatts – amps reactive(KVAR)

24
Q

What is meant by power factor in an AC circuit

A

The ratio of true power to apparent power. It is also the ratio of circuit resistance to circuit impedance,

Electricity (1 decks)

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