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Slide 1

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Physics 2b
Electricity and the atom…read more

Slide 2

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Static Electricity
· When certain insulating materials are rubbed together, negatively
charged electrons will be scraped off one and dumped on the other
· Examples: polythene and acetate rods being rubbed with a cloth
· Electrically charged objects attract small objects placed near them
· NOTE: ONLY ELECTRONS MOVE, a positive static charge means the
electrons are moving away
· Electric charges move easily through conductors…read more

Slide 3

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Current and Potential Difference
· Current The flow of electric charge around the circuit (Amps). Current will
only flow through a circuit if there is a potential difference. More charge
passes around the circuit when a bigger current flows
Current (A)= charge (C)/time(s)
· Potential Difference The driving force that pushes the current around
(Volts). It is the work done (energy transferred, in J) by that electrical
component per unit of charge (Coulombs)
Potential Difference (V)= work done (J)/charge(C)
· Resistance Anything in the circuit that slows the flow down
· The greater the resistance across a component, the smaller the current that
flows (for a given potential difference across a component)…read more

Slide 4

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Circuits- The Basics…read more

Slide 5

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The Standard Test Circuit
· The Ammeter:
-measures the current in Amps flowing through the component
-must be placed in series
-can be put anywhere in the series in the MAIN circuit
· The Voltmeter:
-measures the potential difference in Volts across the
-must be placed in parallel around the component under test
· As you vary the variable resistor it alters the current flowing
through the circuit…read more

Slide 6

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Potential Difference-Current Graphs
· They show how the current varies as you change the potential
-The current is directly -As the temperature -Current will only flow through a
proportional to potential increases, the resistance diode in one direction.
difference. increases -The diode has very high
-Difference resistors have resistance in the opposite
different resistances direction…read more

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