Electric Princables Flashcards
What does can bus stand for
Controller area network, data transfer
What does iso bus stand for
International standard organisation
Why are can wires twisted
To reduce interference
What is the normal resistance down a can wire
60 ohms
What does a zenor diode do
Guarantees a 5 v supply
What causes electrons to flow
Potential difference
What is multiplexing
A term for communication
What is a cathode
A negative, angry cath
Is a speed sensor passive inductive
Yes it is
What is conventional electric flow
POS to neg
What does a parallel circuit looks like
Item stack above one another
What does dc mean
Direct current
What does ac mean
Alternating current
What is current
Rate of which electrons flow
What is resistance
It is when a circuit has a form of resistance to flow
What is electricity
It is the flow of electrons from atom to atom in a conductive material
How many electrons on the outer shell does an insulator have
4 or more
How many electrons are on the outer shell of a conductor
3 or less
What is an atom made from
Neutron, proton and electron
How many electrons does a semi conductor have on outer shell
Only 4 can be manipulated to be either
What is true electron flow
Negative to positive
What is potential difference
It is difference between voltage in 2 components or circuit
What is a milivolt
0.001 volts
What is current measured in
Amps
What is emf
Electromagnetic force
What is a consumer
It is any component within a circuit
What are the rules of a series circuit
Resistance is equal to amount of resistors , and if one device stops working nothing works
What are the rules of a parallel circuit
Resistance will equal smaller then smallest resistor
What wave type does an inductive sensor give out
Sine wave it is a smooth up and down
How do you check resistance of a component
Isolate the component then test using ohms function
What effect happens when a wire is wrapped round a coil
It increases the magnetic field
What is a relay and what is it used for
It is a switch which allows 2 serperate circuits to move current.
Allows low current to switch to hugh current
What are the 2 relay types
Single pole single throw (4 pin)
And single pole double throw (5 pin)
How to measure a parasitic drain
Remove negative removal and set multimeter to amps by moving it to the most left port on positive side.
Connect in series ensuring no connection can happen on battery whatever amps are shown on the screen are the draw it has
How does current work in a series circuit
It is the same at all points
How does a voltage divider work in a series circuit
If there are 2 resistors r 1 and r 2 to work out r1 you would r1 over total resistance x input
How do resistors in parallel work
Total will always be lower then smallest resistor,
1 over r total = 1 over r 1 + 1 over r 2
What are the 3 ways of generating energy
Chemical , magnetism, solar
What is a transistor
Is a micro relay
How is a turbocharger driven
Through exhaust gasses
How could you test an electronic fuel injector
Through a resistance check and a cylinder shutdown check
How to test a common rail sensor
Check resistance through positive and signal and make sure it’s not high resistance or 0 ohms follow manufacturer guideline
Why would a relay be fitted to a headlight circuit
To reduce current through the circuit
In a 12v circuit 2 21 watt brake lamp bulbs are fitted how to work out smallest fuse needed
21 x 2
42 % 12 = 3.5
Need a fuse bigger than 3.5
How to workout voltage through a resistor
Voltage out = voltage in % r2 over total resistance
How to work out a voltage decider circuit
Resistance you want to work out divided by total x input voltage
What is the normal resistance down a can wire
60 ohms
What is a terminator resistance
120 ohms
