Unit 1-3 Flashcards
What is current/induction?
What is it measured in?*
The movement (flow) of electrons through conductor
Ex. wireless charger
Amperage (A)
What is resistance?
What is it measured in?*
Hold, restrict, oppose to the flow of electric current
Property of conductor
Ohms (Ώ)
What is electromotive force?
What is it measured in?*
Pressure/force required to produce electron movement (flow)
Electromotive force = Voltage
Measured in volt (V)*
What is Ohms law?*
What does each letter represent?*
How do you determine what equation to use?*
I = E/R*
R = E/I*
E = IR
E (or V)- electromotive force
I- current (induction)
R- resistance
On the triangle, hide the letter you are looking for and multiply or divide based on the location of the remaining letters
Higher resistance = _____ voltage
Lower resistance = _____ voltage
Regular
Higher
What is a control device?*
Power producer?*
Power consumer?*
Give an example of each.*
Control device
Control the flow of current
ex. toggle switch, solenoid
Power producer
Create current for the electrical circuit
ex. battery, alternator
Power consumer
Device that uses current
ex. coffee maker, navigation light
What is a resistor?
What does it do?*
Electrical component made of metal wire or carbon
Maintain a stable resistance over various environmental conditions
Control the speed of current using resistance
Describe a fixed carbon resistor
What does the circuit diagram symbol look like?*
Ceramic outer core (good insulator)
Carbon film spiral (poor conductor)
Metal lead goes into carbon spiral to offer resistance
A zigzag line
Describe a rheostat
What does the circuit diagram symbol look like?*
Variable resistor
Used for things like dimming lights
A “slider” allows resistance to be increased/decreased
More resistance = dimmer lights
A zigzag line with an arrow pointing to it
Read the following resistor:
Green-Blue-Yellow-Gold
Bands:
Red - 2
Orange - 3
Green - 5
Blue - 6
Multiplier:
Red - 100 Ώ
Yellow - 10K Ώ
Green - 100K Ώ
Tolerance:
Red - +-2%
Green - +-0.5%
Gold - +-5%
5 – 6 – 10K Ώ – (+-5%)
band-band-multiplier-tolerance
560k Ώ (+-5%)
Read the following resistor:
Red-Orange-Violet-Black-Brown
Bands:
Red - 2
Orange - 3
Green - 5
Blue - 6
Violet - 7
Multiplier:
Black - 1 Ώ
Red - 100 Ώ
Yellow - 10K Ώ
Tolerance:
Brown - +-1%
Red - +-2%
Gold - +-5%
2 – 3 – 7 – 1 Ώ – (+-1%)
band-band-band-multiplier-tolerance
237 Ώ (+-1%)
What is a diode?*
What does it do?*
What are the two sides?*
An electronic control device
The main building block of semiconductors
Limit current flow to one direction
Current flows in one direction
Anode (the positive side)
Cathode (the negative side)
On a switch, what is a pole?*
A throw?*
Number input contacts
Number of output contacts per pole
What does it mean if a switch is “momentary”?
Switch returns to its normal position when released
Describe the following switches: (poles/throws)
on-off
momentary on-off
dual on-off
SPST = simple on-off switch
SPST = returns to normally open after releasing the button
DPST = a pair of on-off switches that lead to one throw
