A. A circuit consists of a 12 V battery connected to a switch, which is connecte

Question

A. A circuit consists of a 12 V battery connected to a switch, which is connected to a light bulb of resistance 120 O and then back to the battery. If the switch is open, which statement is true of I (the current through the switch and Vs (the difference in potential across the poles of the switch)?
a. I = 0.1 A, Vs = 0 V
b. I = 10 A, Vs is more than 12 V
c. I = 10 A, Vs = 0 V
d. I = 0 A, Vs = 0 V
e. I = 10 A, Vs is not zero but less than 12 V
f. I = 10 A, Vs = 12 V
g. I = 0.1 A, Vs is not zero but less than 12 V
h. I = 0 A, Vs = 12 V
i. I = 0.1 A, Vs = 12 V
j. I = 0 A, Vs is more than 12 V
k. I = 0 A, Vs is not zero but less than 12 V
l. I = 0.1 A, Vs is more than 12 V
B. A long wire with measurable resistance is connected to a battery of potential difference V, and the current is I. The voltage is now doubled, but a fan keeps the the temperature of the wire from increasing. What will happen to the current I and the resistivity of the wire ??
a. I will remain the same, ? will be quartered
b. I will halve, ? will remain the same
c. I will double, ? will be quartered
d. I will remain the same, ? will quadruple
e. I will remain the same, ? will double
f. I will halve, ? will be quartered
g. I will halve, ? will double
h. I will double, ? will remain the same
i. I will remain the same, ? will halve
j. I will double, ? will quadruple
k. I will double, ? will halve
l. I will halve, ? will quadruple
m. I will remain the same, ? will remain the same
n. I will double, ? will double
o. I will halve, ? will halve
C. Seven identical wires of measurable resistance are attached consecutively to a battery of potential difference V: one end of the first wire is connected to the positive terminal of the battery; the other end of the first wire is connected to one end of the second wire; the other end of the second wire is connected to one end of the third wire, and so on. The free end of the seventh wire is connected to the negative terminal of the battery. The potential difference across wire 1 is V1, and the current flowing through wire 1 is I1, If an eighth identical wire is introduced between the seventh wire and the battery, what happens to V1 and I1?
a. V1 decreases, I1 increases
b. V1 remains the same, I1 increases
c. Both V1 and I1 remain the same
d. V1 remains the same, I1 decreases
e. V1 decreases, I1 remains the same
f. V1 increases, I1 remains the same
g. V1 increases, I1 increases
h. Both V1 and I1 decrease
i. Both V1 and I1 increase
D. Now, seven identical wires of measurable resistance are connected across the the terminals of the battery of potential difference V. (In other words: one end of each wire is connected to the positive terminal of the battery, and the other end is connected to the negative terminal of the battery.) The potential difference across wire 1 is V1, and the current flowing through wire 1 is I1, If an eighth identical wire is now added so it connected like the others (across the battery), what happens to V1 and I1?
a. V1 decreases, I1 remains the same
b. V1 remains the same, I1 increases
c. Both V1 and I1 increase
d. Both V1 and I1 decrease
e. V1 increases, I1 increases
f. V1 remains the same, I1 decreases
g. Both V1 and I1 remain the same
h. V1 increases, I1 remains the same
i. V1 decreases, I1 increases

Suppose a 23.4 V battery is connected to a long cylindrical wire, and a current of 9.46 A flows.
a) How many electrons will pass a given point in the wire every second?
_______electrons
b) What is the total resistance of the wire?
______Ohms

c) If the wire is 65.4 m long, and its diameter is 0.0596 cm, find the resistivity of the wire.
_________Ohms*Meters

d) Find the work done by this battery to push one electron through the entire length of the wire.
_________J

Explanation / Answer

1)h
2)h
3)g

a) How many electrons will pass a given point in the wire every second?
9.46*6.241 × 10^18=59.04*10^18electrons
b) What is the total resistance of the wire?
__2.473____Ohms

c) If the wire is 65.4 m long, and its diameter is 0.0596 cm, find the resistivity of the wire.
1.07*10^-8_________Ohms*Meters

d) Find the work done by this battery to push one electron through the entire length of the wire.
37.44*10^-19_________J

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