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HMS Sultan Revision Notes > Resistance > Flashcards

Resistance Flashcards

1
Q

What is resistance

A

Opposition to current flow

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2
Q

What is resistance measured in?

A

Ohms (

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3
Q

Name some insulators

A

Wood
Paper
Rubber
Mica
Insulating varnish
Porcelain
Plastic
Woven fabrics
Glass

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4
Q

Name some conductors

A

Copper
Brass
Silver
Carbon
Salt water
Aluminium
Platinum
Mercury
Gold

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5
Q

What four factors affect resistance of a conductor

A

Material
Length of conductor
Cross sectional area
Temperature

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6
Q

Why does the length of the conductor affect resistance within the conductor

A

Resistance is directly proportional to the length of the conductor as it the current has longer to travel

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7
Q

The cross sectional area is affects the conductors resistance by…

A

Depending on how thick it is, if it’s thin then more resistance but if it’s thick then less resistance as more room for electrons to flow

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8
Q

How does temperature affect resistance in a conductor?

A

If it heats up the atoms vibrate more slowing down the electron flow as they get in the way but if it’s cool then electrons can flow smoothly

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9
Q

What type of resistance would insulators be looking at

A

Very High resistance

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10
Q

What does the insulators resistance depend on?

A

Thickness of the insulator and material of the insulator

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11
Q

Ohms law is…

A

Shows the relationship between voltage resistance and current

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12
Q

How to find voltage?

A

Current X voltage

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13
Q

How to find current?

A

Voltage \ resistance

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14
Q

How to find resistance?

A

Voltage / current

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15
Q

Three types of circuits

A

Series
Parallel
Series parallel

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16
Q

What is a series circuit?

A

A simple loop from a source with services in SERIES back to the source

17
Q

Example of series

A

Christmas lights, if one light goes out they all go out as the electricity can’t get past that trip in the line

18
Q

How to calculate resistance in a series?

A

Add up all total resistances of all services

19
Q

What is a parallel circuit?

A

Where components are numbered side by side and everything is controlled separately

20
Q

To figure out resistance in a parallel circuit you must?

A

Turn the resistance into fractions,
Find the common denominator and then add the fractions up
Flip the result and turn into a whole number

21
Q

What is unique about a parallel circuit?

A

The voltage stays the same across the whole circuit

22
Q

What is a series parallel circuit?

A

Where a series connects to a parallel circuit

HMS Sultan Revision Notes (9 decks)

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