Electricity 1 Flashcards

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1
Q

EMF of PSU

A

max V a PSU can supply in open cct

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2
Q

PD

A

wd / unit charge

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3
Q

Ohm Law

A

V dp to I if temp + therefore R kept constant

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4
Q

Resistivity (p)

A

Property of material defined by product of R n A divided by L p=RA/L

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5
Q

Thermistor

A

component compromising of Semiconductor with NTC.

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6
Q

NTC

A

inc temp, R dec

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7
Q

Electron charge

A

1.6x10^-19

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8
Q

Proton mass

A

1.67x10^-27

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9
Q

Electron mass

A

9.11X10^-31

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10
Q

Super conductivity

A

Resistivity of material decreases to 0 when material is cooled at/below critical temp.

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11
Q

SC 1

A

MRI

Very Expensive

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12
Q

Terminal PD

A

PD supplied by elec Power source

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13
Q

r

A

R of source that results in energy loss as a charge passes through some. Causes change between EMF and T P.D

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14
Q

Lost volts (ir)

A

Energy wasted per C overcoming the r

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15
Q

Diode

A

forward bias when initial high R + small I until .7V where R rapidly decreases.

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16
Q

Filament lamp

A

increase in I/V leads to inc. temp. therefore inc. R

17
Q

LDR

A

Resistance decrease, Light intensity inc.

18
Q

Bias

A
F = direction of least R
R = direction of greatest R
19
Q

Threshold V

A

Point at which diode will conduct in forward bias.