Electricity 1

Question 1

EMF of PSU

Answer 1

max V a PSU can supply in open cct

Question 2

PD

Answer 2

wd / unit charge

Question 3

Ohm Law

Answer 3

V dp to I if temp + therefore R kept constant

Question 4

Resistivity (p)

Answer 4

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

Question 5

Thermistor

Answer 5

component compromising of Semiconductor with NTC.

Question 6

NTC

Answer 6

inc temp, R dec

Question 7

Electron charge

Answer 7

1.6x10^-19

Question 8

Proton mass

Answer 8

1.67x10^-27

Question 9

Electron mass

Answer 9

9.11X10^-31

Question 10

Super conductivity

Answer 10

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

Question 11

SC 1

Answer 11

MRI

Very Expensive

Question 12

Terminal PD

Answer 12

PD supplied by elec Power source

Question 13

r

Answer 13

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

Question 14

Lost volts (ir)

Answer 14

Energy wasted per C overcoming the r

Question 15

Diode

Answer 15

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

Question 16

Filament lamp

Answer 16

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

Question 17

LDR

Answer 17

Resistance decrease, Light intensity inc.

Question 18

Bias

Answer 18

F = direction of least R
R = direction of greatest R

Question 19

Threshold V

Answer 19

Point at which diode will conduct in forward bias.