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# Electricity - Introduction and Current Electricity

Electricity Concept Map for GCE "O" Level Science (Physics). This is an unfinished prezi.

by

Tweet## Hansen Guay

on 19 July 2010#### Transcript of Electricity - Introduction and Current Electricity

Electricity Current Electricity potential

difference

(p.d.) is the rate of flow of charges p.d. or emf S.I. units: volt (V) work done S.I. units: Joules (J) charge S.I. units: coulombs (C) electromotive

force

(emf) current flows from a high potential to a low potential

the difference in potential is called the potential difference

measured in Volts (V), which is also the S.I. units DEFINITION:

- potential difference is defined as the work done

per unit charge between two points DEFINITION:

- the electromotive force is the work done to drive a unit charge around a complete circuit. refer to energy source i.e. batteries

also measured in Volts W

------

Q V = V

W

Q current number of charges flowing per second no. of charges

= -----------------

time taken Q

I = -------

t I

Q

t current S.I. units: ampere (A) charge S.I. units: coulombs (C) time S.I. units: seconds (s) Resistance current flows along conductor

some conductor allows current to flow easily

others restricts the flow of current (insulators)

the measure of the opposition to current is called resistance DEFINITION:

- resistance is the ratio of the potential difference across a conductor and the current flowing through it R = V

----

I When you apply a p.d. across a conductor, what determines the amount of current flowing through? Introduction Did you know that the terms 'positive' and 'negative' came from Benjamin Franklin? Type of charges:

Positive (+), Negative (-) and neutral The study of moving charges is called electricity What comes to your

mind with the word

'electricity? We use symbols to represent electrical circuits (not in syllabus) Electrical circuit - interconnection of electrical elements Static Electricity Electricity in Biology V = IR

Full transcriptdifference

(p.d.) is the rate of flow of charges p.d. or emf S.I. units: volt (V) work done S.I. units: Joules (J) charge S.I. units: coulombs (C) electromotive

force

(emf) current flows from a high potential to a low potential

the difference in potential is called the potential difference

measured in Volts (V), which is also the S.I. units DEFINITION:

- potential difference is defined as the work done

per unit charge between two points DEFINITION:

- the electromotive force is the work done to drive a unit charge around a complete circuit. refer to energy source i.e. batteries

also measured in Volts W

------

Q V = V

W

Q current number of charges flowing per second no. of charges

= -----------------

time taken Q

I = -------

t I

Q

t current S.I. units: ampere (A) charge S.I. units: coulombs (C) time S.I. units: seconds (s) Resistance current flows along conductor

some conductor allows current to flow easily

others restricts the flow of current (insulators)

the measure of the opposition to current is called resistance DEFINITION:

- resistance is the ratio of the potential difference across a conductor and the current flowing through it R = V

----

I When you apply a p.d. across a conductor, what determines the amount of current flowing through? Introduction Did you know that the terms 'positive' and 'negative' came from Benjamin Franklin? Type of charges:

Positive (+), Negative (-) and neutral The study of moving charges is called electricity What comes to your

mind with the word

'electricity? We use symbols to represent electrical circuits (not in syllabus) Electrical circuit - interconnection of electrical elements Static Electricity Electricity in Biology V = IR