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Circuits & Magnetism Unit Review

Total questions: 32

Worksheet time: 29mins

Name
Class
Date
1.

What is the unit for potential difference?

a)

Ohm

b)

Volt

c)

Watt

d)

Ampere

2.

What is the unit for current?

a)

Ampere

b)

Watt

c)

Volt

d)

Ohm

3.

What is the unit for resistance?

a)

Watt

b)

Joule

c)

Ohm

d)

Volt

4.

If the potential difference is 12 volts and the resistance is 5 ohms, what is the current?

a)

2.4 A

b)

60 A

c)

0.417 A

d)

17 A

5.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
6.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
7.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
8.

This is an example of a ______ circuit

a)

Series

b)

Parallel

c)

Open

d)

Dihexihedral

9.
What size resistor would produce a current flow of 5 Amps with a battery voltage of 12.6 volts
a)
60 Ohms
b)
2.52 Ohms
c)
1.71 ohms
d)
5.04 Ohms
10.
What is the current in a 10V circuit if the resistance is 2Ω?
a)
20 amps
b)
8 amps
c)
5 amps
11.
What is the current in a 120V circuit if the resistance 20Ω?
a)
6 amps
b)
2400 amps
c)
100 amps
12.

How do you calculate total resistance in a parallel circuit?

a)

R1 + R2 + R3

b)

R1 - R2 - R3

c)

1/R1 +1/R2 + 1/R3 = 1/RT

d)

R1 = R2 = R3

13.

How to you calculate the total resistance in a series circuit?

a)

R1 + R2+ R3

b)

R1 - R2 - R3

c)

1/R1 + 1/R2 + 1/R3

d)

R1 = R2 = R3

14.

What is the equivalent or total resistance (Re) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

15.

How would the equivalent resistance be determined?

a)

1 / Req = (1/5) + (1/8) + (1/3) Ω

b)

120 Ω

c)

1.5189873 Ω

d)

1 / Req = (1/5) * (1/8) * (1/3) Ω

16.

the formula to find current when the values of V and R are known is

a)

I = V2R

b)

I = V/R

c)

I = R/V

d)

I=VR

17.
The equivalent resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
18.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
19.

What is the equivalent resistance of three 10,000 Ω resistors in parallel?

a)

33,333 Ω

b)

3.1*10^7 Ω

c)

3.33333*10^14 Ω

d)

3,333.3 Ω

20.
The total current through this circuit is
a)
0.02 amps
b)
0.09 amps
c)
50 amps
d)
9 amps
21.

have a high resistance when electricity flows through them.

a)

insulators

b)

Conductors

c)

Resistance

d)

superconductor

22.

have low resistance when electricity flows through them.

a)

insulators

b)

Conductors

c)

Resistance

d)

superconductor

23.
Magnetism is generated by moving
a)
protons.
b)
electrons.
c)
neutrons.
d)
elements.
24.

What is responsible for the Magnetic Field around Earth?

a)

The Earth's crust

b)

The Earth's molten iron core

c)

The Earth's mantel

d)

The Sun

25.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
26.

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

a)

The magnetic field

b)

The electrostatic field

c)

The piezoelectric effect

d)

The chemical reaction of the magnet and the filings

27.

How can a wire become magnetic?

a)

point it north

b)

add a resistor

c)

heat it up

d)

run a current through it

28.
2 ways to increase the magnetic force of an electro-magnet
a)
Increase the current flow, reduce the number of coils
b)
Increase the voltage, decrease the number of coils
c)
Increase the number of coils and the current flow
d)
Spread out the coils, replace iron core with rubber.
29.

Electric charges always flow from _____ areas to _____ areas.

a)

positive; negative

b)

negative; positive

c)

neutral; negative

d)

neutral; positive

30.

Certain materials respond to magnetic fields by becoming ______________ themselves. ____________ is one of these materials.

a)

magnetic, Plastic

b)

electronic, Iron

c)

magnetic, Iron

d)

electronic, Plastic

31.

Electromagnets are considered to be:

a)

Temporary magnets

b)

Permanent magnets

c)

Fast magnets

d)

Slow magnets

32.

Magnets are made of

a)

brass, copper and aluminum

b)

copper and gold

c)

aluminum and zinc

d)

iron, nickel and cobalt

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