Physical Science

Chapter 7: Electricity

Electricity

1.
__________ is the push that causes charges to move.
A)Voltage difference
B)Resistance
C)Induction
D)Static
2.
Which of the following statements about electric charges is true?
A)Electrical forces act at a distance.
B)Objects must be touching one another to exert electrical force.
C)Air cannot conduct electricity, it is conducted only by solid materials.
D)Opposite electric charges always repel one another.
3.
The rate at which electrical energy is converted to another form of energy is called __________.
A)hydroelectricity
B)energy transformation
C)transmission
D)electrical power
4.
A(n) __________ is a closed, conducting path.
A)circuit
B)current
C)resistor
D)ampere
5.
The law of conservation of charge states that __________.
A)charge is not created or destroyed or transferred from object to object
B)the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change
C)electric charge is not created or destroyed
D)charge can be created and destroyed but can not be transferred
6.
In which type of circuit are there two or more branches for current to move through?
A)open
B)uniform
C)parallel
D)series
7.
According to Ohm's law, as the resistance in a circuit __________, the current __________.
A)increases, remains constant
B)decreases, decreases
C)increases, doubles
D)increases, decreases
8.
Which of the following actions increases the resistance of a wire?
A)making it shorter
B)making it thicker
C)making it longer
D)decreasing the temperature
9.
In which type of circuit does current have only one loop to flow through?
A)series
B)uniform
C)open
D)parallel
10.
The process of transferring charge by touching is called __________.
A)covalent charging
B)charging by contact
C)electron exchange
D)charge conveyance
11.
The purpose of fuses and circuit breakers is to _________.
A)prevent circuits from overheating
B)prevent breaks in the circuit
C)decrease the resistance in a series circuit
D)allow circuits to be overloaded
12.
Electric current in a circuit is measured in _________.
A)ohms
B)watts
C)volts
D)amperes
13.
What exerts the force that causes other electric charges to move?
A)insulators
B)the electric field
C)electrical poles
D)conductors
14.
Electric charges flow from __________.
A)low-resistance areas to high-resistance areas
B)insulators to conductors
C)low-voltage areas to high-voltage areas
D)high-voltage areas to low-voltage areas
15.
Why are metals good conductors of electricity?
A)The outer energy levels of metals are nearly filled.
B)Outer-level electrons are weakly held.
C)Metals do not share the electrons in their outer energy levels.
D)Outer-level electrons are tightly held.
16.
Elements that are shiny and good conductors of electricity are __________ .
A)metalloids
B)colloids
C)metals
D)nonmetals
17.
__________ is the tendency for a material to oppose the flow of electrons.
A)Induction
B)Resistance
C)Transistance
D)Conduction
18.
How much electrical energy is used by an appliance that draws 13 A of current at a voltage difference of 200 V for 1h?
A)2600 W
B)2.6 kWh
C)26 kWh
D)15.38 W
19.
What is the standard voltage difference of electrical energy entering homes in the United States?
A)120 V
B)220 V
C)1200 V
D)12 V
20.
What is the current in a circuit if the voltage difference is 15 V and resistance is 15 W?
A)0.0 A
B)225 A
C)30 A
D)1.0 A