Circuits (201) Test 1
A voltage drop is:
-called a difference of potential -the loss of energy by electrons as they flow through a resistance -the comparison of energy lost from one end of a resistance to the other
If twelve 1.5 MΩ resistors are connected in parallel across 50 V, RT equals ________.
0.125 MΩ
Five coulombs of charge flow past a point in 0.5 seconds. How many amperes of current are flowing? (A= C/s)
10 A
When R1 = 7 kΩ, R2 = 20 kΩ, R3 = 36 kΩ, and R4 = 45 kΩ. What is the total circuit resistance if R1 is in series with a parallel combination of R2, R3, and R4?
17 kΩ
50 mA of current flows through a 10 kΩ resistor. How much power is dissipated. (P = i^2*R)
25 W
What is the total resistance of a parallel circuit with three resistors with the values of 60 Ω, 120 Ω, and 180 Ω?
32.73 Ω
If there is 100 mA of current flowing into a three-branch parallel circuit and two of the branch currents are 40 mA and 20 mA, the third branch current is ________.
40 A
How much energy does a 6 V battery have when it stores 12 coulombs of charge? (V = W/Q)
72 joules
A generator converts electrical energy into mechanical energy.
FALSE
Mesh currents can only flow in a counter-clockwise direction through each loop.
False
What is the significance of a negative sign in the answer for current, when solving network problems?
It means that the negative current flows in the opposite direction from the assigned current
Which one of these statements is TRUE of Kirchhoffʹs voltage law (KVL)?
KVL works correctly with a clockwise or counter-clockwise loop direction.
What circuit law is used in the node voltage method?
Kirchhoff's current law
Which of the following describes two circuit elements that have two points in common?
They are considered to be in parallel.
In double-subscript notation, the voltage Vab is the same as
Va - Vb.
The general current divider equation used to find a branch current is equal to the:
equivalent resistance divided by that branch resistor, multiplied by the total current.
According to Ohm's Law, if resistance were to decrease while voltage remained the same, current would
increase
Resistance and current are ________.
inversely proportional
Which of the following is NOT a voltage source?
light bulb
A voltage divider is always a:
series circuit
Power as it is used in electric circuits can be best defined as:
the rate energy is used over time
A branch is a path that connects:
two nodes
What potential (voltage) exists between two power supply terminals if 5 J of energy is required to move 10 C of charge between the terminals? (V = W/Q)
0.5 V
Two resistors are in series across a 12 V source. If each resistor equals 470 kΩ, what is the voltage across each resistor? (Vx = Vtot * (Rx/Rtot)
6 V
If a lamp transforms 120 joules of energy into light and heat every 2 seconds, how much power does it use?
60 W
If a 10 kΩ and 5 kΩ resistor are connected in series across a 12 V source, the voltage across the 10 kΩ resistor is ________ and the voltage across the 5 kΩ resistor is ________. (Vx = Vtot * (Rx/Rtot)
8 V, 4 V
If three 4.7 kΩ resistors are connected in parallel across a 12 V source, what is the value of PT?
91.9 mW (P = V^2/R)
A parallel circuit can be easily identified because only one end of each component is connected to each other.
FALSE
If 50 Joules are used in ten seconds, the power will be 500 Watts.
FALSE
A short could best be described as a unintended path for voltage.
FALSE (Current)
The power dissipated by a resistor doubles if the applied voltage doubles.
FALSE (P = v^2/R) Power would quadruple
A loop is a closed current path in a circuit.
TRUE
Kirchhoff's Current Law states that the sum of the currents into a junction must equal the sum of the currents out of that junction.
TRUE
The current that flows through series elements of a circuit is the same through each element.
TRUE
When parallel resistors are of three different values, the smallest resistor will dissipate the greatest amount of power.
True (p = v2/R Voltage is the same across all parallel resistors which is divided by resistance. Therefore, the smallest resistor will have the greatest power dissipation. )
