MCA III Final EXAM UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
What is the difference between analog and digital? - CORRECT ANSWERS Digital has 2 values
(binary), while analogue is a continuum of possible inputs and outputs.
What is EMF? - CORRECT ANSWERS Electromotive force: the electrical pressure that causes
electrons to flow through the conductor. (DC)
What can create EMF? - CORRECT ANSWERS Batteries and Generators
How do batteries work? - CORRECT ANSWERS They produce a direct current (DC)(in one
direction), and usually work through redox reactions.
How do generators work? - CORRECT ANSWERS Mechanical energy is used to quickly spin a
metal coil in between magnets, creating an alternating current (AC) (back and forth)
What is the symbol for Ohms? - CORRECT ANSWERS Ω
What is the symbol for current? - CORRECT ANSWERS I (also sometimes A, for Amperes)
What is the symbol for Amps? - CORRECT ANSWERS A
What is an ampere? - CORRECT ANSWERS An ampere is the rate of flow of 1 coulomb of charge
per second. (That's a flow of 6.25 billion billion electrons per second.) (current)
What are the three necessary component of a circuit? - CORRECT ANSWERS A closed, cyclical
path (if not closed, the path is called an open circuit)
A load to receive voltage (if no load, the path is called a short circuit)
, A source of power
How do you calculate the combined resistance of resistors in series? - CORRECT
ANSWERS R1+R2=R12 (arithmetic)
How do you calculate the combined resistance of resistors in parallel? - CORRECT
ANSWERS 1/((1/R1)+(1/R2))=R12 (harmonic)
What is true about current and voltage in a circuit with parallel resistors? - CORRECT
ANSWERS The voltage drops for each resistor are always equal, but the current is the voltage drop
divided by the resistance.
What is true about current and voltage in a circuit with resistors in series? - CORRECT
ANSWERS The currents following the resistors will always be equal, and the voltage drops are
current*resistance
How does one solve a combination circuit? - CORRECT ANSWERS Simplify the circuit until it is
as if it only has one resistor. For that circuit, use the resistor to find the voltage drop and the current of the
entire circuit. From there, go back one step of simplification. If the new circuit has two resistors in
parallel, the voltage drop is half the total voltage drop for both new resistors, and you can use that to find
current for each of them. If the new resistors are in series, the current is the same for all of them, and the
voltage drop can be calculated. You then repeat this step until the circuit is fully representative of the
original, and this way each resistor will have the correct corresponding current and voltage
How do you use a multimeter? - CORRECT ANSWERS Use it as part of the circuit after the point
where you want to measure voltage drop, current, or resistance.
What component is absolutely necessary in an arduino sketch? - CORRECT ANSWERS The setup
function
What is an arduino sketch? - CORRECT ANSWERS The program for an arduino
QUESTIONS AND CORRECT ANSWERS
What is the difference between analog and digital? - CORRECT ANSWERS Digital has 2 values
(binary), while analogue is a continuum of possible inputs and outputs.
What is EMF? - CORRECT ANSWERS Electromotive force: the electrical pressure that causes
electrons to flow through the conductor. (DC)
What can create EMF? - CORRECT ANSWERS Batteries and Generators
How do batteries work? - CORRECT ANSWERS They produce a direct current (DC)(in one
direction), and usually work through redox reactions.
How do generators work? - CORRECT ANSWERS Mechanical energy is used to quickly spin a
metal coil in between magnets, creating an alternating current (AC) (back and forth)
What is the symbol for Ohms? - CORRECT ANSWERS Ω
What is the symbol for current? - CORRECT ANSWERS I (also sometimes A, for Amperes)
What is the symbol for Amps? - CORRECT ANSWERS A
What is an ampere? - CORRECT ANSWERS An ampere is the rate of flow of 1 coulomb of charge
per second. (That's a flow of 6.25 billion billion electrons per second.) (current)
What are the three necessary component of a circuit? - CORRECT ANSWERS A closed, cyclical
path (if not closed, the path is called an open circuit)
A load to receive voltage (if no load, the path is called a short circuit)
, A source of power
How do you calculate the combined resistance of resistors in series? - CORRECT
ANSWERS R1+R2=R12 (arithmetic)
How do you calculate the combined resistance of resistors in parallel? - CORRECT
ANSWERS 1/((1/R1)+(1/R2))=R12 (harmonic)
What is true about current and voltage in a circuit with parallel resistors? - CORRECT
ANSWERS The voltage drops for each resistor are always equal, but the current is the voltage drop
divided by the resistance.
What is true about current and voltage in a circuit with resistors in series? - CORRECT
ANSWERS The currents following the resistors will always be equal, and the voltage drops are
current*resistance
How does one solve a combination circuit? - CORRECT ANSWERS Simplify the circuit until it is
as if it only has one resistor. For that circuit, use the resistor to find the voltage drop and the current of the
entire circuit. From there, go back one step of simplification. If the new circuit has two resistors in
parallel, the voltage drop is half the total voltage drop for both new resistors, and you can use that to find
current for each of them. If the new resistors are in series, the current is the same for all of them, and the
voltage drop can be calculated. You then repeat this step until the circuit is fully representative of the
original, and this way each resistor will have the correct corresponding current and voltage
How do you use a multimeter? - CORRECT ANSWERS Use it as part of the circuit after the point
where you want to measure voltage drop, current, or resistance.
What component is absolutely necessary in an arduino sketch? - CORRECT ANSWERS The setup
function
What is an arduino sketch? - CORRECT ANSWERS The program for an arduino
