electricity - resistance

Question 1

What is resistance?

Answer 1

A measure of how difficult it is to pass an electric current through a component.

Question 2

What is resistance cause by?

Answer 2

The electrons that flow colliding with atoms of the component.

Question 3

What does the resistance of a component depend on?

Answer 3

The potential difference across it and the current flowing through it.

Question 4

What is resistance measured in?

Answer 4

ohms

Question 5

What is the equation to find resistance?

Answer 5

V = IR
potential difference = current x resistance

Question 6

When p.d increases what does the current do?

Answer 6

It also increases

Question 7

What does the total resistance equal?

Answer 7

R1 + R2 + …

Question 8

How does the difference in the thickness of the wire effect the resistance?

Answer 8

The thicker the wire, the lower the resistance

Question 9

What is resistance in a wire affected by?

Answer 9

The length of the wire
The thickness of the wire
The temperature of the wire
The material of the wire

Question 10

What is the resistance of a filament lamp?

Answer 10

resistance increases as it gets brighter and hotter.

Question 11

What resistance graph is this?
https://i.stack.imgur.com/5dg9x.gif

Answer 11

a filament lamp

Question 12

Does a filament lamp obey ohms law?

Answer 12

no

Question 13

What is ohms law?

Answer 13

A law stating that electrical current is proportional to p.d and inversely proportional to resistance.

Question 14

What is the resistance like in an ohms resistor?

Answer 14

It is constant

Question 15

Does an ohms resistor obey ohms law?

Answer 15

yes

Question 16

What resistance graph is this?
https://o.quizlet.com/ygEG3rgWKsMlpXd5xo-1OA.png

Answer 16

ohms resistor

Question 17

What is the resistance like in a diode?

Answer 17

If it is forward biased it has zero resistance
When it is reverse biased it has infinite resistance

Question 18

What resistance graph is this?
https://www.ossila.com/files/1/0823/0287/files/diode-iv-curve.png?1999614258181120511

Answer 18

a diode

Question 19

What is the resistance like in a LDR (light dependent resistor)?

Answer 19

changes resistance with varying light intensity.

Question 20

What resistance graph is this?
https://images.twinkl.co.uk/tr/image/upload/t_illustration/illustation/Light-Intensity-LDR-and-Resistance-Graph-Answer—Edexcel-Science-Secondary.png

Answer 20

a LDR (light dependent resistor)

Question 21

What is the resistance like in a thermistor?

Answer 21

It changes it resistance with temperature

Question 22

What resistance graph is this?
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.ametherm.com%2Fthermistor%2Fntc-thermistor-beta&psig=AOvVaw2kkFh2ou7zJg6N-6v_K-p2&ust=1636701545947000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCOiFzcfij_QCFQAAAAAdAAAAABAD

Answer 22

a thermistor

Question 23

What does a sensing circuit do?

Answer 23

it turns on or increases the current to components depending on the conditions they are in.

Question 24

What does a wire do?

Answer 24

It is an electrical conductor that is ohmic

Question 25

What does a resistor do?

Answer 25

It limits the flow of current

Question 26

What does a filament lamp do?

Answer 26

It has a thin wire that heats up when the current flows and emits light

Question 27

What does a diode do?

Answer 27

It only allows current to flow in one direction

Question 28

What does a LED do?

Answer 28

It only allows current to flow in one direction and emits light.

Question 29

What does a LDR do?

Answer 29

As light intensity increases, resistance decreases

Question 30

What does a thermistor do?

Answer 30

As temperature increases, resistance decreases

Question 31

what is the equation to find power

Answer 31

Power = current squared x resistance