Area A

Piece of wire

II

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

Resistor (e.g light bulb)

battery

Which of the following diagrams best represents the conventional current in the circuit on the right?

I

I

I1

I1 > I2

I

I2

no currenthere

(c)(a) (b)

(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

The voltage measured between two points in an electrical circuit is

(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 II

12V

12V

circuit I

a) Circuit I

b) The two emit the same amount of light

c) Circuit II

If the light bulbs in the figure above are identical, which circuit puts out more light?

V

A B

C

DI

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.

(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)

A B

R

R

R

In the circuit below, the total resistance between ‘a’ and ‘b’ is

3

1a) 3 b) c)

3 33

d) e)

RR

R

RR

a bRR R

In the circuit below, the total resistance between ‘a’ and ‘b’ is

3

1 1a) 3 b) c)

3 3

d) e) 3

R RR

R R

Which is correct ?

(a) I1+ I2 - I3 = 0

(b) I1+ I3 = I2

(c) I3 + I2 = I1

(d) none of these

Which is correct ? (consider left loop in direction of arrow)

a)

b )

c )

d )

e ) no ne o f these

3 1 0 2 0

3 1 0 2 0

3 1 0 2 0

3 1 0 2 0

1 2

1 2

1 2

1 2

V I I

V I I

V I I

V I I

10 Ω

+ +

3 Ω

2 Ω

I1 I2

I3