Electrical Theory
Two resistors are connected in parallel; R1 is 90ohm, R2 is 45ohm. What is the total resistance of R1 and R2 in parallel?
30ohm
Kirchhoffs voltage law states that the algebraic sum of the voltages around any closed current path is_____________.
zero
Find the total resistance in a series circuit with three résistances of 10ohm, 20ohm, and 30ohm.
60ohm
_________________states that the total amount of current flowing through a parallel circuit is equal to the sum of the amounts of current flowing through each current path.
Kirchhoff's current law
Which statement is not correct relative to Kirchhoff's current law?
Kirchhoff's laws apply to current only.
__________________states that the sum of all the voltage drops in a circuit is equal to the source voltage of the circuit.
Kirchhoff's voltage law
________________contain two or more parallel paths through which current can flow.
Parallel circuits
The formula for calculating the total resistance in a parallel circuit with three resistors is_______________.
RT=1/1/R1+1/R2+1/R3
The formula for calculating the total resistance in a series circuit with three resistors is
RT=R1+R2+R3
Which formula does not apply to a parallel circuit?
RT=R1+R2+R3
When calculating series-parallel combination circuits, it is important to______________.
Reduce to series loads, then add the loads. Replace parallel combinations with one value and reduce to simpler circuits where possible.
______________contain only one path for current flow.
Series circuits
______________contain both series and parallel current paths.
Series-parallel circuits
If two or more resistors are connected in parallel, the______________.
total resistance is lower than any single resistor.
Two 24ohm resistors are in parallel, and a 42ohm resistor is in series with the combination. When 78V is applied to the three tresistors, the voltage drop across the 42ohm resistor is about______________.
?????
A 242ohm resistor is in parallel with a 180ohm resistor, and a 420ohm resistor is in series with the combination in a 27V circuit. A current of 22mA flows through the 242 ohm resistor. the current through the 180 ohm resistor is_____________.
??????
A resistor of 32ohm is in parallel with a resistor of 36ohm, and a 54ohm resistor is in series with the pair. When 350V is applied to the combination, the current through the 54ohm resistor is_______________.
??????
In a series circuit, E T must equal the sum of the individual voltage drops.
True
Kirchhoff's voltage law can be used to determine voltage drops.
True
Parallel circuits are current dividers.
True
You can use ohm's law to find the value of each branch current in a parallel circuit.
True
In a parallel circuit, the voltage across each path is equal to the_______________.
applied voltage
