PHY 102 EXAM SET 2025/2026 QUESTIONS AND
SOLUTIONS MARKED A+
✔✔when 4 1.5V batteries connected, output age of combo is measured 1.5V, batteries
connected in: - ✔✔parallel
✔✔When someone whose car has dead battery, how should ur car battery be
connected in relation to dead battery: - ✔✔in parallel
✔✔when several 1.5V batteries connected, output 12V, how many batteries needed to
achieve this? - ✔✔eight
✔✔To move 3.0C of charge from one electrode to another, a 12V battery must do how
much work? - ✔✔W = qΔV = (3.0 C)(12 V) = 36 J
✔✔In circuit diagram, battery represented by: - ✔✔two unequal length lines
✔✔More charge flows past given point on wire when wire has a current of - ✔✔all same
currents because q = It.
✔✔Least current - ✔✔1.5 C passing a given point in 1.5 min because I = q/t.
✔✔Convention current in what direction in dentist X-ray - ✔✔West bc Electrons have
negative charges but conventional current is defined for positive charges.
✔✔In a current carrying metal wire, the drift velocity of the electrons is in the order of: -
✔✔a few millimeters per seconds.. The electrical signal (the energy) through the wires
is transmitted near the speed of light, but the actual motion of the charges is quite slow,
of the order of a few mm/s.
✔✔When light switch goes on, electric energy gets to bulb at speed on order of: -
✔✔speed of light
✔✔Ohm is another term for the - ✔✔volt per amp
✔✔If you double the voltage across a resistor while the same time cutting resistance to
1/3 OG value, what happens? - ✔✔increases by 6 times
✔✔Both length and diameter of cylinder resistor are doubled? what happened to
resistance? - ✔✔diameter, increase by a factor of 4.. length, doubles the resistance
✔✔Electric power unit watt is equivalent to: - ✔✔A2xohm, J/s, V2/ohm
, ✔✔If voltage across resistor doubled, the expended in resistor is: - ✔✔increased by a
factor of 4 Since P = V2/R, doubling the voltage will increase the power by a factor of 4.
✔✔Current halved, power expend by resistor is: - ✔✔decreases by factor of 4 Since P =
I2R, halving the current will reduce the power by a factor of ( )2 = .
✔✔The drift of speed of electrons in a complete circuit is a few mm per sec. Yet lamp is
3.0m away from light switch and turns on when u flip switch. Why? - ✔✔electric field in
the wire propagate at close to the speed of light
✔✔Filaments in bulbs fail after bulb turned on rather than when they've been on for
awhile. Why? - ✔✔When the light is first turned on, the filament is cool so its resistance
is low and the current is high. Once the lamp is hot, its resistance increases and current
decreases, so there is less chance of burning out since the rate of heating is now lower.
✔✔Why voltage drops in parallel - ✔✔When internal resistance increases the terminal
voltage drops.
✔✔What would happen to power outlet when you plugged a 240V europe outlet
designed for 120V from united states? - ✔✔power output would quadruple and it would
overheat and burn out.
✔✔Which one gives off more power when heating across 12 V battery, 5 ohm or 10
ohm resistor? - ✔✔the smaller (5.0 Ω) resistor dissipates more power than the larger
one.
✔✔Which of allowing must be same for resistors in series? - ✔✔current
✔✔Which must be same in parallel? - ✔✔voltage
✔✔2 resistors connected to serries 12V battery, RA has 9V across it, which one has
least resistance? - ✔✔B
✔✔Correctly measure voltage, volt meter connected in: - ✔✔in parallel with it b/c volts
must be same
✔✔Are the voltage drops across resistors in series generally the same? If not, under
what circumstances could they be the same? - ✔✔No but if all resistors equal, the
voltages across are the same
✔✔Are the joule heating rates for resistors in series the same? - ✔✔No, they must have
the same resistance if they want to be
SOLUTIONS MARKED A+
✔✔when 4 1.5V batteries connected, output age of combo is measured 1.5V, batteries
connected in: - ✔✔parallel
✔✔When someone whose car has dead battery, how should ur car battery be
connected in relation to dead battery: - ✔✔in parallel
✔✔when several 1.5V batteries connected, output 12V, how many batteries needed to
achieve this? - ✔✔eight
✔✔To move 3.0C of charge from one electrode to another, a 12V battery must do how
much work? - ✔✔W = qΔV = (3.0 C)(12 V) = 36 J
✔✔In circuit diagram, battery represented by: - ✔✔two unequal length lines
✔✔More charge flows past given point on wire when wire has a current of - ✔✔all same
currents because q = It.
✔✔Least current - ✔✔1.5 C passing a given point in 1.5 min because I = q/t.
✔✔Convention current in what direction in dentist X-ray - ✔✔West bc Electrons have
negative charges but conventional current is defined for positive charges.
✔✔In a current carrying metal wire, the drift velocity of the electrons is in the order of: -
✔✔a few millimeters per seconds.. The electrical signal (the energy) through the wires
is transmitted near the speed of light, but the actual motion of the charges is quite slow,
of the order of a few mm/s.
✔✔When light switch goes on, electric energy gets to bulb at speed on order of: -
✔✔speed of light
✔✔Ohm is another term for the - ✔✔volt per amp
✔✔If you double the voltage across a resistor while the same time cutting resistance to
1/3 OG value, what happens? - ✔✔increases by 6 times
✔✔Both length and diameter of cylinder resistor are doubled? what happened to
resistance? - ✔✔diameter, increase by a factor of 4.. length, doubles the resistance
✔✔Electric power unit watt is equivalent to: - ✔✔A2xohm, J/s, V2/ohm
, ✔✔If voltage across resistor doubled, the expended in resistor is: - ✔✔increased by a
factor of 4 Since P = V2/R, doubling the voltage will increase the power by a factor of 4.
✔✔Current halved, power expend by resistor is: - ✔✔decreases by factor of 4 Since P =
I2R, halving the current will reduce the power by a factor of ( )2 = .
✔✔The drift of speed of electrons in a complete circuit is a few mm per sec. Yet lamp is
3.0m away from light switch and turns on when u flip switch. Why? - ✔✔electric field in
the wire propagate at close to the speed of light
✔✔Filaments in bulbs fail after bulb turned on rather than when they've been on for
awhile. Why? - ✔✔When the light is first turned on, the filament is cool so its resistance
is low and the current is high. Once the lamp is hot, its resistance increases and current
decreases, so there is less chance of burning out since the rate of heating is now lower.
✔✔Why voltage drops in parallel - ✔✔When internal resistance increases the terminal
voltage drops.
✔✔What would happen to power outlet when you plugged a 240V europe outlet
designed for 120V from united states? - ✔✔power output would quadruple and it would
overheat and burn out.
✔✔Which one gives off more power when heating across 12 V battery, 5 ohm or 10
ohm resistor? - ✔✔the smaller (5.0 Ω) resistor dissipates more power than the larger
one.
✔✔Which of allowing must be same for resistors in series? - ✔✔current
✔✔Which must be same in parallel? - ✔✔voltage
✔✔2 resistors connected to serries 12V battery, RA has 9V across it, which one has
least resistance? - ✔✔B
✔✔Correctly measure voltage, volt meter connected in: - ✔✔in parallel with it b/c volts
must be same
✔✔Are the voltage drops across resistors in series generally the same? If not, under
what circumstances could they be the same? - ✔✔No but if all resistors equal, the
voltages across are the same
✔✔Are the joule heating rates for resistors in series the same? - ✔✔No, they must have
the same resistance if they want to be
