Physics:2b
- Created by: Ridha Ahmed
- Created on: 21-03-15 13:44
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- Physics:2b
- Static electricity
- when certain insulating materials are rubbed together, electrons are transferred from one to the other.
- resulting in a +charged material, and one - charged
- charged objects can attract other objects, that are near them.
- resulting in a +charged material, and one - charged
- polyethene rod rubbed with cloth; rod becomes negative
- Acetate rod rubbed with cloth, rod becomes positive.
- when certain insulating materials are rubbed together, electrons are transferred from one to the other.
- Current and Potential difference
- current- flow of electric charge around a circuit
- only flows through a component if there is potential difference across the component
- measured in ampere/ amps
- current(amps)= charge (coulombs)/ time(seconds)
- current- flow of electric charge around a circuit
- Circuits
- symbols
- Test circuits are used to test components or make V-I graphs.
- ammeter, component and resistor placed in series/ main circuit, NOT IN PARALLEL.
- voltmeter placed in parallel, near the component under test
- Potential difference- current graphs (v-I)
- shows how current varies as pd is changed
- current through a resistor (at a constant temp) is directly proportional to current.
- resistance= 1/gradient
- diodes
- made from semi conductors eg. silicon
- used to regulate pd in circuits
- Static electricity
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