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# GCSE Physics Revision - P4

Everything frm P4 (taken from the CGP textbook for GCSE OCR Gateway Physics Higher Level)
by

## Cherisse Noon

on 30 November 2012

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#### Transcript of GCSE Physics Revision - P4

P4 Revision By Cherisse Noon Static Electricity Uses of Static Electricity Charge in Circuits Build up of static is caused by friction. Paint Sprayers: the spray gun is charged which charges the drops of paint. The painted object has the opposite charge, attracting the paint particles. This method gives the object an
even coat of paint. Current: the amount of electrical charge around a circuit - the flow of
electrons. Measured in amps (A)
Voltage: the driving force that pushes the current around. Measured in
volts (V)
Resistsance: anything in the circuit that slows the flow down. Measured in
Ohms.
There's a Balance: the voltage is trying to push the current around the circuit,
and the resistance is opposing it. insulating materials are rubbed together,
electrons will be scraped off one and onto
the other, leaving a positive static charge on
one, and a negative static charge on the
other. Electrically charged objects attract
small neutral objects. Only electrons
move, never the positive charges.
If enough static builds up, it
can cause shocks. Electrons have a negative charge. When 2 Static Electricity - Nuisance 1) Attracting Dust: dust particles are charged and will be attracted to anything with the opposite charge. Many objects around the house are easily charged and attract the dust particles. 2) Clothing Clings: When synthetic clothes are dragged over each other, electrons get scraped off, leaving static charges on both, leading to attraction. Little shocks occur as the charges rearrange. 3) Door Handles: If you walk on a nylon carpet wearing
shoes with insulating soles, charge builds up on your
body. Then if you touch a metal door handle, the
charge flows via the conductor and you get a
little shock. Dust Precipitators: smoke is made up of tiny particles, which can be removed with a precipitator. As smoke particles reach the bottom of the chimney, they reach a wire grid, charged negatively. The particles gain electrons and becme negatively charged. The dust particles enduce a charge on the earthed metal plates, attracting the particles to the metal plates. Defibrillators: the beating of a human heart is controlled by electrical pulses. An electric shock can be used to restart a heart. Hospitals and amblances use defibrillators which are used for this purpose. They are placed on the chest of the patient for good electrical contact, and are charged up. The charge passes through the paddles to the patient to make the heart contract. If you increase the VOLTAGE - then MORE CURRENT will flow.
If you increase the RESISTANCE - then LESS CURRENT will flow. (or MORE VOLTAGE needed to keep theSAME CURRENT flowing). If you provide more voltage, the current will increase. If you put in more resistance the current will decrease.
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