DC Electricity Flashcards
What is important about the Valence Shell?
The less electrons in the valence shell the more likely that the electron can be moved.
What is Electrostatic?
- Opposites Attract 2. Likes Repel
What is the Electron Current?
The flow of electrons from negative to positive. As one electron is added, it replaces and pushes out the next electron, and that one does the same and so on. The effect is instantaneous no matter the length of the conductor.
What is Current?
The flow of electrons through a conductor. It’s unit of measure is Amperes or Amp expressed as I.
What is Voltage?
The potential difference between positive and negative. It’s unit of measure is the Volt expressed as V.
What is Resistance?
The opposition to Current Flow. It’s unit of measure is the Ohm expressed as R.
What factors effect resistance?
The conductors length, diameter, material and temperature.
Explain Ohm’s Law?
The current in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.
What are the four requirements of a circuit?
Conductor, Load, Power Source / Voltage Source, Switch
What is a conductor?
Any material that will allow electrons to move within it freely.
What is an Insulator?
A material that does not allow the electrons to move within it freely.
What does a Capacitor do?
Store electrons.
What will happen to batteries in series?
Increase voltage but the amperage will remain the same.
What will happen to batteries in parallel?
Increase the amperage but voltage will remain the same.
What are the four requirements for arming and fuzzing circuits?
Voltage Source - Battery/Capacitor, Load - Detonator / Bulb / ect., Conductor - Wire, Switch - Control element / Switch
What are the Laws of Series Circuits?
The sum of the individual voltage drops around a series circuit equals the applied voltage, Current has the same value at any point within a series circuit, The sum of the individual resistances within a series circuit equals the total resistance of that circuit, To add the total resistance R1=R1+R2
What are the Laws of Parallel Circuits?
The voltage of a parallel circuit is the same across each branch of that circuit, The total current in a parallel circuit is equal to the sum of the individual branch currents, The total resistance in a parallel circuit is always less or approximately equal to the value of the smallest resistive branch
1 =1 +1 +1
Rt R1 R2 R3
Explain Switch Contacts?
Common - regardless of the switch will always be used (When at rest) Normally Open (NO) Normally Closed (NC)
What are Relays?
Electromagnetic Switch
What are some of the dangers of Relays?
- Battery Decay
- Cutting the Wire
- Anti-Disturbance (caused by weak battery)
What causes a collapsing circuit to function?
Battery decay, cutting the wire and anti-disturbance.
What causes movement of the contacts in a relay?
The energizing / de-energizing of the coil. The relay is an electromagnetic switch.
Explain the Voltage in a series circuit?
It will change across each load in accordance with the amount of resistance
Explain the Voltage in a parallel circuit?
The voltage stays the same across all paths in parallel
The work in a circuit is performed by the?
Current / Amperage
What is the definition of electricity?
The flow of electrons through simple materials and devices
