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Electricity

Total questions: 28

Worksheet time: 26mins

Name
Class
Date
1.
During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...
a)
the plastic strip acquired extra protons from the cotton.
b)
the plastic strip acquired extra protons from the charging process 
c)
protons were created as the result of the charging process
d)
the plastic strip lost electrons to the cotton during the charging process 
2.
Insulators are different than conductors in that insulators ____.
a)
do not contain electrons or protons 
b)
 do not contain any charge
c)
have a weaker affinity for electrons 
d)
do not allow charge to freely move 
3.
A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod
a)
gains electrons
b)
loses electrons
c)
gains protons
d)
loses protons
4.
A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper
a)
must be positive
b)
must be negative
c)
may be neutral or negative
d)
may be neutral or positive 
5.
Which net charge could be found on an object?
a)
4.8 x 10-19 C
b)
1.8 x 10-19 C
c)
3.0 x 10-19 C
d)
2.8 x 10-19 C
6.
Electrostatic force F exists between two point charges. If the both charges are doubled, the force between the charges will be
a)
F
b)
4F
c)
2F
d)
F/4
7.
A metal sphere having an excess of +5 elementary charges has a net electric charge of
a)
8.0 x 10-19 C
b)
8.0 x 1019 C
c)
1.6 x 10-19 C
d)
5.0 x 10-19 C
8.
In the diagram below, P is a point near a negatively charged sphere. Which direction best represents the direction of the electric field at point P?
a)
Right
b)
Left
c)
Up 
d)
Down
9.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
10.
At which point is the electric field the weakest?
a)
A because it is the furthest away
b)
A because the field lines are further apart
c)
C because the field lines are further apart
d)
C  because it is the furthest away
11.
An electrostatic force of 2 X 102. newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is
a)
8 X 102 N/C
b)
5 N/C
c)
2 X 10-2 N/C
d)
50 N/C
12.
QA and QB are two charges creating an electric field. Based on the electric field lines, we can conclude
a)
QA and QB are both positive
b)
QA and QB are both negative
c)
QA is positive and QB is negative
d)
QA is negative and QB is positive
13.
Voltage is measured in __.
a)
volts.
b)
watts.
c)
coulombs. 
14.
As the resistance of a circuit increases, the current will
a)
increase
b)
decrease
c)
stay the same
15.
Current has units: 
a)
kilowatt·hour 
b)
ampere 
c)
coulomb 
d)
volt 
16.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
17.

A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance

a)

58 Ω

b)

0.33 Ω

c)

13 Ω

d)

1 Ω

18.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
19.

A metal wire of length 1000 mm and cross-sectional area 0.20mm2 has a resistance of 8.0Ω.


What is the resistance of a wire of the same metal of length 500 mm and cross-sectional area of 0.40 mm2?

a)

2.0 Ω

b)

8.0 Ω

c)

16 Ω

d)

32 Ω

20.

Which two changes to a metal wire both increase resistance?

a)

decreasing its length and increasing its temperature

b)

increasing its length and decreasing its temperature

c)

decreasing its thickness and increasing its temperature

d)

increasing its thickness and decreasing its temperature

21.

A kilowatt-hour is equivalent to

a)

1000 W.

b)

3600 J.

c)

3,600,000 J/s.

d)

3,600,000 J.

22.

What potential difference is required across an 8.0-Ω resistor to cause 2.0 A to flow through it?

a)

4.0 V

b)

16 V

c)

8.0 V

d)

32 V

23.

A 200-W light bulb is connected across a 100-V dc power supply. What current will flow through this bulb?

a)

0.90 A

b)

0.36 A

c)

0.60 A

d)

2.0 A

24.

A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?

a)

100 Ω

b)

8.0 × 10-3 Ω

c)

120 Ω

d)

240 Ω

25.

The resistance of a material

a)

depends on its resistivity and the geometric properties of the material.

b)

does not depend on its resistivity or the geometric properties of the material.

c)

depends on its resistivity but not the geometric properties of the material.

d)

does not depend on its resistivity but on the geometric properties of the material.

26.

Wire A has twice the cross sectional area of wire B. The resistance of wire B is __________________ wire A.

a)

1/4 as much as

b)

1/2 as much as

c)

the same as

d)

twice as much as

27.

Which of the following aluminum wires would have the greatest resistance?

a)

3 cm in length and 2 cm in diameter

b)

6 cm in length and 2 cm in diameter

c)

9 cm in length and 2 cm in diameter

d)

12 cm in length and 2 cm in diameter

28.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current

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