Can you calculate
What is the resistance of a light bulb that uses 15 watts of power when placed across a 15-volt battery?
15 ohms
According to Kirchoff's current law, the current in a parallel circuit is equal to_______.
The sum of the currents in each branch
Which of the following is true regarding a parallel circuit?
It has more than one path for current flow
True or False? You can use ohm's law to find the value of each branch current in a parallel circuit.
true
Which formula is used for series circuits?
RT = R1 + R2 = R3
The statement that total current entering a point must equal total current leaving that point best describes_____.
Kirschoffs law
According to kirchhoff's voltage law, the total voltage drop in a circuit is equal to the ______.
voltage of the power source
Which of the following is true regarding a series-parallel circuit?
If a circuit is reduced to an equivalent series circuit, the total resistance is found by adding the loads.
States that current in a circuit is proportional to the voltage and inversely proportional to the resistance.
OHMS LAW
The formula for calculating the total resistance in a series circuit with three resistors is ____________?
RT = R1 + R2 + R3
There are four resistors in a circuit with an applied voltage of 120v. The voltage drops across three resistors is 15v each. What is the voltage drop across the fourth resistors?
75 v
Two branches of a circuit (R1 and R2) across a 120V power line draw a total line current of 30A. Branch R1 takes 15A. What s the current I2 in branch R2?
15A
A circuit in which two or more components are connected equally across the same voltage source is a_______
parallel circuit
What happens when batteries are connected in series vs. parallel?
Series → increases total voltage.
Parallel → increases total current capacity
the formula for calculating the total resistance in a parallel circuit with three resistors is __________?
RT = 1/ (1/R1 + 1/R2 + 1/R3)
The total resistance of four resistors in parallel with values of 3, 10, 25, and 50 ohms is ______.
2.03 ohms
True or False? Kirchhoff's voltage law can be used to determine voltage drops.
True
What happens to the current in a series circuit as it moves through each component?
The current stays the same throughout the circuit.
Why measure voltage and current?
Voltage and current measurements are taken because resistance cannot be measured on a circuit that is powered.
Formula; Calculating Power using Voltage and Current
V x I
A circuit has a voltage of 100 volts across five resistors in parallel (5, 14, 21, 25, and 100 ohms). The total current is _____.
36.9 A
If the energy of an electric charge flowing in a circuit is conserved, which of the following obeys the Kirchhoff junction rule?
The sum of the current flowing in is equal to the sum of current flowing out.
In a parallel circuit, the voltage across each path is equal to the _________?
applied voltage
What causes circuit resistance to increase?
Circuit resistance typically increase due to poor connections, loose connections, corrosion, or damaged components.
Formula; Calculating Power using Voltage and Resistance
V(Squared) divided by R