Download Electric circuits


I
I
Area A
Piece of wire
If the piece of wire is made twice as long but has the same
cross-sectional area, its resistance:
(a) doubles
(b) is halved
(c) remains the same
(d) can’t tell
Which of the following
diagrams best represents the
conventional current in the battery
circuit on the right?
(a)
(b)
I
I
(c)
I1
I2
I1 > I2
Resistor
(e.g light bulb)
I
no current
here
The voltage measured between two points in an electrical circuit is
(a) the potential energy change for a charge moved between these
two points
(b) the potential energy change per unit charge moved between
these two points
(c) the amount of electric charge per second passing through the
circuit between these two points
(d) the resistance to current flow between
these two points
(e) None of the above
Which is the correct form of Ohm’s law?
(a) I = V/R
(b) I = R/V
(c) I=VR
(d) I= (VR)-1
(e) None of the above.
circuit I
circuit II
12V
12V
If the light bulbs in the figure above are identical,
which circuit puts out more light?
a) Circuit I
b) The two emit the same amount of light
c) Circuit II
Rank the following identical bulbs in order of brightness. The
brightness of each of these bulbs depends only on the magnitude of
the electric current through it which, in turn, is determined by the
amount of electrical resistance in the part of the circuit through
which that current flows.
I
V
A
B
D
C
(a) A>B>C>D
(b) A>B>C=D
(c)A=B>D>C
(d) D>C>A=B
(e) C>A=B>D
Which of the following meter positions is used to measure
1. the current through the wire to the resistor?
2. the voltage across the resistor?
(a)
(b)
(c)
In the circuit below, the total resistance between ‘a’ and ‘b’ is
R
R
A
B
R
a)
3R
3
d)
R
R
b)
3
e) R 3
1
c)
3R
In the circuit below, the total resistance between ‘a’ and ‘b’ is
R
R
R
a
a)
b
3R
d) R
3
1
b) R
3
e) R  3
1
c)
3R
10 Ω
3Ω
I1
I2
Which is correct ?
(a) I1+ I2 - I3 = 0
(b) I1+ I3 = I2
+
+
2Ω
(c) I3 + I2 = I1
(d) none of these
I3
Which is correct ? (consider left loop in direction of arrow)
a)
b)
c)
d)
e)
 3V  10 I1  2 I 2  0
 3V  10 I1  2 I 2  0
 3V  10 I1  2 I 2  0
 3V  10 I1  2 I 2  0
none of these