Basic Electricity 1 Study Guide Flashcards
- What are valence electrons?
Outer shell
- Materials that have 5 or more valence electrons are known as what?
Insulator
- Materials that have less than 4 valence electrons are known as what?
Conductor
- Actual current flow is from
Negative to Positive.
- The conventional theory says electricity flows from
Positive to Negative.
- What is E.M.F.?
Electromotive Force
- What is E.M.F. measured in?
Voltage
- What letter is used to represent voltage (E.M.F.)?
E
- Current is defined as?
Flow of electron
- Current is measured in what unit?
Amps
- What letter is used to designate current?
I
- Resistance is defined as what?
Opposition to electron flow
- Resistance is measured in what?
Ohms
- Resistance is designated by what letter?
R
- Power is defined as what?
Work done in a circuit
- Power is measured in what?
Watts
- What letter is used to designate power?
P
- Convert .0056 volts to milli-volts.
5.6 kV
- Convert 24,175 ohms to kilo-ohms.
24.175k Ohms
- Convert 31.7 mega-ohms to ohms.
31,700,000 Ohms
- Convert 5.3 micro-amps to amps.
0.0000053m A
- What are the two formulas used to represent ohms’ law?
E=IR P=IE
- What voltage is required to push 3 amps through 800 ohms of resistance?
2400 V
- How much resistance would be present in a 24 volt circuit with 4.8 amps of current?
5 Ohms
- How much current would flow through a circuit having 50 kilo-ohms of resistance and 100 volts?
0.002 V
- What is the power used by a circuit having 1.2 amps through 150 ohms of resistance?
216 W
- What is the total power of a 24 volt circuit having four 1200 ohm resistors in series?
.12 W
- What remains constant in a series circuit?
Current
- What remains constant in a parallel circuit?
Voltage
- The first band on a resistor designates what?
First significant digit
- The second band on a resistor designates what?
Second significant digit
- The third band on a resistor designates what?
Multiplier (number of zeros)
- The fourth band on a resistor designates what?
Tolerance
- If there is no fourth band, the resistor tolerance will be what?
+/- 20%
- What would the value of a resistor with the following color code be; Green, Yellow, Red, Silver.
5400 Ohms +-10%
- What would the value of a resistor with the following color code be; Blue, Brown, Grey, Gold.
6,200,000,000 +- 5%
- Magnetic lines of flux will (go through, or go around) soft iron?
Go Through
- Magnetic fields flow from
North to South
- Static electricity will distribute evenly on Uniform surfaces, but will collect on
Rough surfaces.
- What is the “left hand rule” for conductors?
Thumb - direction of electron flow / Fingers - direction of flux travel.
- What is the “left hand rule” for coils?
Thumb - Points to north pole / Finger - Direction of electron flow.
- A rheostat controls power by _________
through a circuit.
Varying The Current
- A potentiometer controls power by
_______
through a circuit.
Varying The Voltage
- As the length of a wire increases, the resistance will
Increase
- As the diameter of a wire increases, the resistance will
Decrease
- What type of circuit breakers do aircraft have?
Push
- Excessive Static charges can be eliminated on an aircraft in flight by the use of what?
Static Wick
- Electromagnetic induction is when electricity is produced by moving a
Conductor Through A Line Of Magnetic Flux.
- What is used to statically balance aircraft structures to the same electrical potential?
Bonding Strap
- Kirchhoff’s voltage law means that if I have a 12 Volt battery in a circuit that the loads in the circuit will use a total of ____
volts.
Zero
- A voltmeter is connected into a circuit how?
Parallel
- An ammeter is connected into a circuit how?
Series
- What are the steps for connecting an ohmmeter in a circuit?
Power off, parallel, and isolated
- What type of meter supplies its own power?
Ohmmeter
- What is the purpose of the reflective strip on the face of an analog meter?
Act like a mirror for accurate reading view straight on.