Reducing Voltage Flashcards

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1
Q

What is mains electricity

A

230V

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2
Q

What do step down transformers do?

A

Reduce the voltage from 230V to a dutiable value for electronic devices

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3
Q

How are all transformers made?

A

Winding wire around iron or another magnetic material

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4
Q

What are the 2 coils in a step down transformer

A

Primary and secondary coil

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5
Q

Is there electrical connection between coils ?

A

No the connection is magnetic

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6
Q

In an electrical supply the primary coil is connected to where?

A

Mains supply

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7
Q

In an electrical supply where is the secondary coil connected to?

A

Electronic circuit

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8
Q

When the a.c. Voltage in the primary coil is switched on what is caused?

A

An a.c. Current

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9
Q

What does current cause

A

Change un magnetic field

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10
Q

What does the iron core guide

A

The magnetic field into the secondary coil

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11
Q

What does the changing magnetic field cause

A

A.c. Voltage

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12
Q

What is the process of converting ac to dc called

A

Rectification

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13
Q

What part of the circuit causes ac to convert to dc

A

Rectifier

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14
Q

What are the active components in rectifiers

A

Diodes

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15
Q

What is ac

A

When the direction of electron flow is constantly changing

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16
Q

What is dc

A

The direction flow of electrons never changes

17
Q

What is a full wave rectifier

A

Its output is rapidly changing from zero to peak

18
Q

What is a half wave rectifier

A

Its output is not a constant value and for half the rime the output voltage is zero to peak

19
Q

What is a smoothed output

A

When there is only a small ripple on the output voltage

20
Q

When the output voltage of the rectifier is increasing the capacitor is

A

Charged to peak

21
Q

When output voltage decreases what happens to the capacitor

A

Discharged slowly

22
Q

When the crest of the rectifier is recharged what happens

A

The whole process begins again