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Electricity - Introduction and Current Electricity
Transcript of Electricity - Introduction and Current Electricity
(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
(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
Q current number of charges flowing per second no. of charges
time taken Q
I = -------
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