deck_15340834 Flashcards
In a series current what is the same and what is different?
Current same Volatge shared
In a parallel circuit what is the same and what is different?
Current shared and Voltage same.
What colour is the earth wire?
Yellow and green
What colour is live wire?
Brown
What colour is neutral wire?
Blue
What does live wire do?
The live wire carries the alternating potential difference from the
supply
What does neutral wire do?
The neutral wire completes the circuit.
What does earth wire do?
The earth wire is a
safety wire to stop the appliance becoming live.
What is an beta particle?
a high speed electron ejected from the
nucleus as a neutron turns into a proton
In a series circuit what is the total resistance?
the total resistance of two components is the sum of the
resistance of each component.
Key fact for parallel cicuit for resistance?
the total resistance of two resistors is less than the resistance
of the smallest individual resistor.
What do you do to get from ma to A
/1000
How are ameter added to a circuit?
ammeter in series with the compotent
How are voltmeter added to a circuit?
In parallel with the compotent
What does a diode do?
Only lets current flow in 1 direction high resistance in 1 direction and low resistance in another direction
What does a step up transformer do?
Increases the voltage which in turn decreases current reducing the power lost due to heating in the c able
How do power station produce there energy?
At high current
What does a step down tansformer do ?
Decrease voltage to make it safe for households
What is solid to gas called?
Sublimation
What is internal energy?
The sum of the potential energy + kinetic energy
Who did the gold foil experiment?
Rutherford
Who created plum pudding?
JJ Thomoson
Who discovered nucleus is posotive charge?
Rutherford
Who discoverd outer electron shell and electron?
Neils Bohr
Who discoverd neutrons?
James Chadwick
What is the particle for alpha decay?
Helium or 2 proton +2 neutron
What stops beta particle?
few mm of alluminium
What stops Alpha particle
Paper
What is radioactivity?
Is the rate of decay in a sample of radioactive material.
What do Unstable nuclei do?
Will decay to be more stable,emmiting radiation in the process.
What is the unit of activity for a radiactive substance?
Becquerel or Counts per second
What is half life?
time it takes for half the radioactive nuclei to decay.
