Electricity Flashcards
What is the definition of electricity
The flow of electrons through simple materials and devices
Electrons leave an atom from what shell
The valance shell,the outer most shell of electrons in an atom
How does electricity flow from a battery
Negative to positive
What is the definition of current
The flow of electrons through a conductor
Measurement of current
Amps (A) or (I)
What is the definition of voltage
The potential difference between two points in an electric circuit
Resistance
The opposition of current flow (everything is a resistor) (r)
Unit of resistance
Ohms
Ohms law
The current (amps) in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance (v/ixR)
4 requirements for a circuit
1.) power source 2.)conductor 3.)switch 4.) initiator / load
Conductor
Any material that allows elections to move free
Insulator
Any material that doesn’t allow electrons to move free
Result of a short on a battery
1.) premature exhaustion of battery life
2.) Heat
3,) possible buttery explosion
What happens to the total amps and volts Chen butteries are placed in series parallel
First add the volts in series and add the total amperage in parallel
6 methods of producing voltage
-Friction
-Pressure
-Heat
-Light
-Chemical reaction
-magnetism
Relay is an example of what kind of switch
Electro-magnetic switch (collapsing)
What causes a collapsing circuit to function
-Battery decay
-cutting the wrong wire
-anti-disturbance
What causes movement of the contacts in a relay
Magnetism
What do capacitors do
Store energy (can be power source)
Work in a circuit is performed by what
-current
-amps
-amperage
What moves through a circuit
Electrons
What moves through a circuit
Electrons
What moves electrons
Voltage
What affects resistance
-diameter
-length
-material
-temp
Z atomic particles that make up an atom
Proton and neutron
What happens to batteries in series
They increase voltage, supplied current (amperage) will remain the same,
What happens to batteries in series
They increase voltage, supplied current (amperage) will remain the same,
How do you add voltage with batteries in series.
Count the small bars, each is 1.5 volts
Example:
4 bars = 6 volts
What happens to batteries in parallel
Increase supplied amperage and volts stay the same
Adding amperage
Example:
500 mAH per battery you have 3 batteries = 1500 mAH
Determine resistance with loads in parallel.
(R1 x R2)
(R1 + R2) = ohms
Resistance in a circuit with loads in series parallel
Add the amps in series, then add in parallel to get the total amps.
How to add resisters
Running in series you add the resistance to get total amps
Running in parallel use the equation above to get total amps
What type of circuit is a relay considered
Collapsing circuit
Cautions to consider when working a relay collapsing circuit
Anti disturbance
Battery decay
Cutting wrong wire
How does a collapsing circuit function
Battery decry
What causes movement of the contacts in relay
Energizing or de-energizing of the coil the relay is a electromagnetic switch
