Series/Parallel Resistive Circuits Flashcards
What is a schematic diagram?
Schematic diagrams are electrical drawings that show components in their electrical sequence (or scheme) without regard for physical location.
Schematic diagrams can also be called ___ diagrams.
circuit diagrams, ladder diagrams or ladder logic.
What 2 things are electrical diagrams made up of?
- Symbols that represent the components in the circuit and
2. lines that represent connections between the components
A series circuit must be drawn in a schematic style.
True or False
False
The opposition a material offers to current flow due to its structure is called what?
Resistance
What is resistance measured in?
Ohms, Ω
If the circuit only has one path for current to flow along it is a ___ circuit.
series
Never measure the resistance of any energized object or circuit.
True or False
True
What is an ohmmeter?
A device that measures resistance in an electronic component or circuit. It can also be part of another electrical testing device called a multimeter.
What is an open circuit?
A circuit with a continuity break
The equation of resistance in a series circuit is what?
R˕=R₁+R₂+R₃+…
Transposed:
R₂=R˕-R₁-R₃.
What is potential difference?
A difference in electric pressure between two points in an the electric circuit. Measured in volts (V).
What is a closed loop?
It’s a circuit drawing style, often referred to as a closed circuit.
What is Kirchhoff’s Voltage Law?
It states that the algebraic sum of all voltages in a closed loop must equal zero. The mathematical equation is
E-V₁-V₂-V₃=0V. It also states that the applied voltage must equal the sum of the voltage drops. E=V₁+V₂+V₃+…
What is current?
The flow of electrons past any point in a given period of time in an electric circuit. The measurement for current is an ampere (A).
What is the device that measures current in a circuit?
An ammeter
The mathematical equation for current in a series circuit is what?
I˕=I₁=I₂=I₃
What is a ratio?
A comparison of two like quantities. One thing compared to or related to another thing; it is just a statement or an expression.
What is a proportion?
Two equal ratios. A proportion is an equation that can be solved.
eg. 1:2=2:4
(The two inside terms are the means, and the two outside terms are the extremes)
In direct proportion, changing one quantity (or number) changes the other quantity (or number) by the same ratio.
True or False
True
What is an indirect proportion? (also called an inverse proportion)
And indirect proportion occurs when increasing one quantity decreases the other quantity or when decreasing one quantity also increases the other.
What is the voltage divider rule?
The rule states the voltage divided between series resistors is directly proportional to the resistance of the resistors.
What can the voltage divider rule be used to solve?
Simple series circuits
If you were to connect a voltmeter across a closed switch in a series circuit what would the meter read?
0 V
In an open series circuit, the voltage drop across the switch equals the applied voltage.
True or False
True
What is a parallel circuit?
A circuit which current can flow through more than one path or branch.
What is the mathematical equation for voltage in a parallel circuit?
E=V₁=V₂=V₃=…
In parallel circuits, each resistance load added in parallel to the circuit ____ total current flow and ____ the total resistance of the circuit.
increases, decreases
In a parallel circuit, the total resistance is always less than the lowest resistance value of any branch.
True or False
True
What is the mathematical equation for resistance in a parallel circuit?
R˕=_____1______
1 1 1
R₁+R₂+R₃+…
What is Kirchhoff’s Current Law?
The algebraic sum of currents entering and leaving a junction point in a closed circuit is zero. Also, that all current values entering a junction point must equal all current values leaving the junction point.
What is the mathematical equation for current in a parallel circuit?
I˕=I₁+I₂+I₃+…
When an open circuit occurs in a parallel circuit, the total line current of the circuit ____ and the total resistance of the circuit ____.
decreases, increases.
Four resistors are connected in series. If one of the resistors becomes open, the resistance of the circuit would now be:
a) zero ohms
b) the sum of the other 3 resistors
c) infinite
c) infinite
What is the unit of measurement for dielectric strength?
Volts per mm
Which has the lowest resistance?
a) Silver
b) Iron
c) Copper
d) Aluminum
a) Silver
A parallel circuit consists of two resistors, if the ohmic value of R2 is decreased then the current through R1 will:
a) increase
b) decrease
c) stay the same
c) stay the same
