PHY 112 Lab Exam Questions &
Answers (Grade A+)
If the voltage in a circuit increases, but the resistance remains the
same, then the current will -
correct answer ✅increase
Write two equations for equivalent resistance Re below: the first
equation for two resistors R1 and R2 in series, and the second
equation for R1 and R2 in parallel. -
correct answer ✅series: Req= R1+R2
parallel: Req=(R1xR2/R1+R2)
Resistors R1 and R2 have resistances to 36 ohms and 60 ohms,
respectively. Find RE for each of the cases below. Show your work
for each case. -
correct answer ✅Req=R1+R2=36+60=96ohms
Req=(R1xR2/R1+R2)=(36x60)/(36+60)=22.5 ohms
Write the equations for Ohm's Law and Resistivity below. -
correct answer ✅Ohm's Law: V=IR
Resistivity: P= RA/l
,PHY 112 Lab Exam Questions &
Answers (Grade A+)
Which physical quantity is represented by the slope of the line in
the V vs. I plot given below? -
correct answer ✅As V increases so does I
represents resistance
Write the Si unit for all the following:
Length, cross-sectional area, current, applied voltage, resistivity -
correct answer ✅meters (m)
3.14 r^2 =m^2
amps (A)
Volts (V)
Resistivity (ohmsxm)
Was the equivalent resistance RE, high when R1 and R2 were in
series or parallel in the 2nd part of the Ohm's Law lab activity?
Explain -
correct answer ✅Series because the resistance in a series circuit is
evenly passed through both resistors compared to a parallel circuit
where the charge is unevenly distributed
In the 3rd part of the Ohm's Law lab activity, which of the measured
values is the most unreliable? -
, PHY 112 Lab Exam Questions &
Answers (Grade A+)
correct answer ✅The most unreliable value was the length of the
pencil lead because the alligator clips could not be precisely clipped
on the lead. The further away the clips were the more resistivity.
Write the formula used to calculate charge. -
correct answer ✅Q=CV
Q=charge
C=capacitance
V=voltage
Give the name and a brief description of the physical attribute used
to determine the capacitance C of the discharging capacitor in
today's lab. -
correct answer ✅C=I/M
m is the slope obtained from the voltage vs time graph. you can
also use the corner of the peak to determine the maximum voltage
and time it took to discharge
Give a brief description of capacitance, its units, and the equation
that governs capacitance below. Clearly define all variables used in
the equation. -
correct answer ✅units: Farads (F)
Answers (Grade A+)
If the voltage in a circuit increases, but the resistance remains the
same, then the current will -
correct answer ✅increase
Write two equations for equivalent resistance Re below: the first
equation for two resistors R1 and R2 in series, and the second
equation for R1 and R2 in parallel. -
correct answer ✅series: Req= R1+R2
parallel: Req=(R1xR2/R1+R2)
Resistors R1 and R2 have resistances to 36 ohms and 60 ohms,
respectively. Find RE for each of the cases below. Show your work
for each case. -
correct answer ✅Req=R1+R2=36+60=96ohms
Req=(R1xR2/R1+R2)=(36x60)/(36+60)=22.5 ohms
Write the equations for Ohm's Law and Resistivity below. -
correct answer ✅Ohm's Law: V=IR
Resistivity: P= RA/l
,PHY 112 Lab Exam Questions &
Answers (Grade A+)
Which physical quantity is represented by the slope of the line in
the V vs. I plot given below? -
correct answer ✅As V increases so does I
represents resistance
Write the Si unit for all the following:
Length, cross-sectional area, current, applied voltage, resistivity -
correct answer ✅meters (m)
3.14 r^2 =m^2
amps (A)
Volts (V)
Resistivity (ohmsxm)
Was the equivalent resistance RE, high when R1 and R2 were in
series or parallel in the 2nd part of the Ohm's Law lab activity?
Explain -
correct answer ✅Series because the resistance in a series circuit is
evenly passed through both resistors compared to a parallel circuit
where the charge is unevenly distributed
In the 3rd part of the Ohm's Law lab activity, which of the measured
values is the most unreliable? -
, PHY 112 Lab Exam Questions &
Answers (Grade A+)
correct answer ✅The most unreliable value was the length of the
pencil lead because the alligator clips could not be precisely clipped
on the lead. The further away the clips were the more resistivity.
Write the formula used to calculate charge. -
correct answer ✅Q=CV
Q=charge
C=capacitance
V=voltage
Give the name and a brief description of the physical attribute used
to determine the capacitance C of the discharging capacitor in
today's lab. -
correct answer ✅C=I/M
m is the slope obtained from the voltage vs time graph. you can
also use the corner of the peak to determine the maximum voltage
and time it took to discharge
Give a brief description of capacitance, its units, and the equation
that governs capacitance below. Clearly define all variables used in
the equation. -
correct answer ✅units: Farads (F)
