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

Question

1) A circuit consists of a 12 V battery connected to a switch, which is connected to a light bulb of resistance 120 ? 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 A, Vs is not zero but less than 12 V
B)I = 0 A, Vs = 12 V
C)I = 0 A, Vs = 0 V
D)I = 10 A, Vs is not zero but less than 12 V
E)I = 0.1 A, Vs = 0 V
F)I = 10 A, Vs = 0 V
G)I = 10 A, Vs is more than 12 V
H)I = 0.1 A, Vs is not zero but less than 12 V
I)I = 10 A, Vs = 12 V
J)I = 0.1 A, Vs is more than 12 V
K)I = 0 A, Vs is more than 12 V
L)I = 0.1 A, Vs = 12 V

2) 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 halve, ? will halve
B)I will halve, ? will quadruple
C)I will remain the same, ? will remain the same
D)I will halve, ? will double
E)I will remain the same, ? will halve
F)I will double, ? will quadruple
G)I will remain the same, ? will quadruple
H)I will double, ? will halve
I)I will halve, ? will be quartered
J)I will double, ? will be quartered
K)I will double, ? will double
L) I will double, ? will remain the same
M)I will remain the same, ? will double
N)I will remain the same, ? will be quartered
O)I will halve, ? will remain the same

3) 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 increases, I1 increases
B)V1 increases, I1 remains the same
C) Both V1 and I1 decrease
D)V1 remains the same, I1 decreases
E)Both V1 and I1 remain the same
F)Both V1 and I1 increase
G)V1 decreases, I1 remains the same
H)V1 remains the same, I1 increases
I)V1 decreases, I1 increases

4) 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 remain the same
D)Both V1 and I1 decrease
E)V1 increases, I1 remains the same
F)V1 decreases, I1 increases
G)V1 increases, I1 increases
H)V1 remains the same, I1 decreases
I)Both V1 and I1 increase

Explanation / Answer

1. b 2. L 3. C 4. B

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