EGR 102 UPDATED SCRIPT 2026 PRACTICE
SOLUTIONS GRADED A+
● 1 a. what are voltage current and resistance, what units are they
measured in. Answer: Voltage is an electromotive force, the force caused
by electrons being the same charge adn pushing each other . it is
measued in volts. current is the quantity of the electrons flowing past
over a given amount of time and is measured in amps. resistence is a
measure of how difficult it is to move the current and is related to the
energy expended moving. It is measured in ohms , abbreviated
● b. we had a water analogy, what is the electrical equivalent of
pressure, water flow rate, restrictions in pipe. Answer: in the water
analogy the pressure is thesame thing as the voltage the water flow rate
the same thing as current and restrictions in the pipe the resistance
● B. what do we call this kind arrangement (series or parallel). Answer:
the circuit is a series cut
● E. if I increase the voltage from 10 V to 15 volts, what happens to the
current? What happens to the voltage drop across each resistor?.
Answer: if i up the 10 Volts, then the current will increase and the
voltage dropped across each resistor will increase.(Now it will be
roughly 1/3 of 15 volts across each, or about 5 volts)
, ● F. what is the value of the yellow, blue, orange, gold resistor. Answer:
The value is 46*1K = 46000
● G. what would be its tolerance. Answer: Tolerance gold +/ -5 %= (05.
* 46000) = +/- 2300
● 3A. what is the symbol for NPN and PNP resistor. Answer: Symbols -
----- mnemonic: Not pointing iN, points iN Proudly
● B. why are transistors important in computers. Answer: Transistors
are electricity-controlled switches inside computers that allow voltages
to represent numbers (1 is turned on and 0 is turned off - the basis for
binary numbers)
● C. if you have only one PN junction, what type of component do you
have?. Answer: One PN junction is a diode. Two give you a transistor.
(Our LED is a light emitting diode)
● D. How do you turn on an NPN transistor. Answer: The NPN
transistor turns on when voltage is applied to the base "B". That lets
current flow from the collector "C" to the emitter "E"
● 4 A. what kind of device is an Arduino, and what are things like
Arduinos used for. Answer: Arduinos are board with microcontrollers on
them (on our board, the large chip) they are very useful when you need a
SOLUTIONS GRADED A+
● 1 a. what are voltage current and resistance, what units are they
measured in. Answer: Voltage is an electromotive force, the force caused
by electrons being the same charge adn pushing each other . it is
measued in volts. current is the quantity of the electrons flowing past
over a given amount of time and is measured in amps. resistence is a
measure of how difficult it is to move the current and is related to the
energy expended moving. It is measured in ohms , abbreviated
● b. we had a water analogy, what is the electrical equivalent of
pressure, water flow rate, restrictions in pipe. Answer: in the water
analogy the pressure is thesame thing as the voltage the water flow rate
the same thing as current and restrictions in the pipe the resistance
● B. what do we call this kind arrangement (series or parallel). Answer:
the circuit is a series cut
● E. if I increase the voltage from 10 V to 15 volts, what happens to the
current? What happens to the voltage drop across each resistor?.
Answer: if i up the 10 Volts, then the current will increase and the
voltage dropped across each resistor will increase.(Now it will be
roughly 1/3 of 15 volts across each, or about 5 volts)
, ● F. what is the value of the yellow, blue, orange, gold resistor. Answer:
The value is 46*1K = 46000
● G. what would be its tolerance. Answer: Tolerance gold +/ -5 %= (05.
* 46000) = +/- 2300
● 3A. what is the symbol for NPN and PNP resistor. Answer: Symbols -
----- mnemonic: Not pointing iN, points iN Proudly
● B. why are transistors important in computers. Answer: Transistors
are electricity-controlled switches inside computers that allow voltages
to represent numbers (1 is turned on and 0 is turned off - the basis for
binary numbers)
● C. if you have only one PN junction, what type of component do you
have?. Answer: One PN junction is a diode. Two give you a transistor.
(Our LED is a light emitting diode)
● D. How do you turn on an NPN transistor. Answer: The NPN
transistor turns on when voltage is applied to the base "B". That lets
current flow from the collector "C" to the emitter "E"
● 4 A. what kind of device is an Arduino, and what are things like
Arduinos used for. Answer: Arduinos are board with microcontrollers on
them (on our board, the large chip) they are very useful when you need a
