Physics 2B

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  • Created by: Rachel
  • Created on: 28-12-12 11:59
What is the build up of static electricity caused by?
friction
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What is current?
The flow of electric charge around the circuit
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What is potential difference?
The driving force that pushes the current around
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What is resistance
Anything in the circuit which slows the flow down
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How does resistance increase with temperature?
When electrical charge flows through a reistor, electrical energy is transferred into heat energy and the resistor gets hot. The heat energy causes the ions in the conductor to vibrate more, making it harder for the electrons to pass, resistance +
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Hazards in the home
Long cables, frayed cables, cables incontact with wet or hot, shoving things in socks, water near sockets, damaged plugs, to many plugs in one socket, light sockets without bulbs and appliances with no covers
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Name three wires
Live wire, neutral wire and earth wire
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Ada vantages of circuit brakers
More convenient, work faster and can detect smaller current surges.
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Information on alpha particles
two neutrons and two protions, they are big and heavy, slow moving, don't penetrate very well, they are strongly ionising
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Information on Beta particles
move quite fast and are quite small, penetrate moderately into materials, moderately ionizing, for every B-particle emitted a neutrons turns into a proton in the nucleus
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Gamma radiation
penetrate far into materials, weakly ionising, no charge and no mass
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Three background radiation sources
naturally occurring unstable isotopes, cosmic rays and man-made sources
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What is half-life?
The average time it takes for the number of nuclei in a radioactive sample to halve
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What is nuclear fission?
Splitting up of large atomic nuclei
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What is nuclear fusion?
joining of small atomic nuclei
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Safety precautions of radioactive substances
never look directly in the eye, never allow skin contact, store in a lead box, wear lead clothing and keep exposure to a minimum and always hold with tongs
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Other cards in this set

Card 2

Front

What is current?

Back

The flow of electric charge around the circuit

Card 3

Front

What is potential difference?

Back

Preview of the front of card 3

Card 4

Front

What is resistance

Back

Preview of the front of card 4

Card 5

Front

How does resistance increase with temperature?

Back

Preview of the front of card 5
View more cards

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