DC Electricity

Question 1

What is important about the Valence Shell?

Answer 1

The less electrons in the valence shell the more likely that the electron can be moved.

Question 2

What is Electrostatic?

Answer 2

1. Opposites Attract 2. Likes Repel

Question 3

What is the Electron Current?

Answer 3

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.

Question 4

What is Current?

Answer 4

The flow of electrons through a conductor. It’s unit of measure is Amperes or Amp expressed as I.

Question 5

What is Voltage?

Answer 5

The potential difference between positive and negative. It’s unit of measure is the Volt expressed as V.

Question 6

What is Resistance?

Answer 6

The opposition to Current Flow. It’s unit of measure is the Ohm expressed as R.

Question 7

What factors effect resistance?

Answer 7

The conductors length, diameter, material and temperature.

Question 8

Explain Ohm’s Law?

Answer 8

The current in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.

Question 9

What are the four requirements of a circuit?

Answer 9

Conductor, Load, Power Source / Voltage Source, Switch

Question 10

What is a conductor?

Answer 10

Any material that will allow electrons to move within it freely.

Question 11

What is an Insulator?

Answer 11

A material that does not allow the electrons to move within it freely.

Question 12

What does a Capacitor do?

Answer 12

Store electrons.

Question 13

What will happen to batteries in series?

Answer 13

Increase voltage but the amperage will remain the same.

Question 14

What will happen to batteries in parallel?

Answer 14

Increase the amperage but voltage will remain the same.

Question 15

What are the four requirements for arming and fuzzing circuits?

Answer 15

Voltage Source - Battery/Capacitor, Load - Detonator / Bulb / ect., Conductor - Wire, Switch - Control element / Switch

Question 16

What are the Laws of Series Circuits?

Answer 16

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

Question 17

What are the Laws of Parallel Circuits?

Answer 17

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

Question 18

Explain Switch Contacts?

Answer 18

Common - regardless of the switch will always be used
(When at rest)
Normally Open (NO)
Normally Closed (NC)

Question 19

What are Relays?

Answer 19

Electromagnetic Switch

Question 20

What are some of the dangers of Relays?

Answer 20

• Battery Decay
• Cutting the Wire
• Anti-Disturbance (caused by weak battery)

Question 21

What causes a collapsing circuit to function?

Answer 21

Battery decay, cutting the wire and anti-disturbance.

Question 22

What causes movement of the contacts in a relay?

Answer 22

The energizing / de-energizing of the coil. The relay is an electromagnetic switch.

Question 23

Explain the Voltage in a series circuit?

Answer 23

It will change across each load in accordance with the amount of resistance

Question 24

Explain the Voltage in a parallel circuit?

Answer 24

The voltage stays the same across all paths in parallel

Question 25

The work in a circuit is performed by the?

Answer 25

Current / Amperage

Question 26

What is the definition of electricity?

Answer 26

The flow of electrons through simple materials and devices