# Using Electricity And Magnetism

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In chapter 3 of Book N you discovered how electricity is generated. You also studied how electrical energy is used in motors and other devices. Choose the letter which best answers the following questions. Be sure to print out your certificate with your name and bring it to class. Ms. Pati

• 1.

### 1. The relationship between electricity and magnetism is called

• A.

Electrical energy.

• B.

An electromagnet.

• C.

Electromagnetism.

• D.

Induced current.

C. Electromagnetism.
Explanation
The relationship between electricity and magnetism is known as electromagnetism. This term describes the interaction between electric currents and magnetic fields. When an electric current flows through a conductor, it generates a magnetic field around it. Similarly, a changing magnetic field can induce an electric current in a nearby conductor. Electromagnetism is a fundamental concept in physics and is the basis for many technological applications, such as electric motors and generators.

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• 2.

### 2. A coil of wire with a current is called a

• A.

Generator.

• B.

Motor.

• C.

Solenoid.

• D.

Transformer.

C. Solenoid.
Explanation
A coil of wire with a current is called a solenoid because a solenoid is a cylindrical coil of wire that produces a magnetic field when an electric current flows through it. This magnetic field can be used to create mechanical motion or to generate or transform electrical energy. Generators and motors are devices that use a solenoid, but they are not the actual coil of wire itself. A transformer, on the other hand, is a device that uses two or more solenoids to transfer electrical energy between different circuits, but it is not a single coil of wire with a current.

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• 3.

### 3. A magnetic field is always produced by

• A.

Magnets and by electric current.

• B.

A stationary charge.

• C.

Neutral particles.

• D.

A copper wire.

A. Magnets and by electric current.
Explanation
A magnetic field is always produced by magnets and by electric current. Magnets have a property called magnetism, which allows them to create a magnetic field around them. This magnetic field can attract or repel other magnets or magnetic materials. Similarly, when electric current flows through a wire, it creates a magnetic field around the wire. This is known as electromagnetism and is the principle behind many electrical devices such as motors and generators. Therefore, both magnets and electric current are sources of magnetic fields.

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• 4.

### 4.  Galvanometers are used to measure

• A.

Static electric charge on objects.

• B.

Small currents for gauges.

• C.

Mechanical energy of transformers.

• D.

Magnetic fields of permanent magnets.

B. Small currents for gauges.
Explanation
Galvanometers are devices used to measure small currents in gauges. These small currents are typically used to measure and indicate various parameters such as temperature, pressure, or fluid levels. Galvanometers work based on the principle of electromagnetic induction, where the current flowing through a coil produces a magnetic field that interacts with a permanent magnet, causing a deflection in the needle or pointer. Therefore, the correct answer is "small currents for gauges."

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• 5.

### 5. When a wire coil moves in a magnetic field,

• A.

A current is induced in the wire.

• B.

The strength of the magnetic field increases.

• C.

There is no effect unless the magnet moves also.

• D.

A force causes the wire to rotate.

A. A current is induced in the wire.
Explanation
When a wire coil moves in a magnetic field, a current is induced in the wire. This is because the motion of the wire coil through the magnetic field creates a change in the magnetic flux, which in turn generates an electromotive force (EMF) according to Faraday's law of electromagnetic induction. This induced EMF causes a current to flow in the wire, resulting in the generation of electrical energy.

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• 6.

### 6. Which of the following uses the mtion in an electric field to produce an electric current?

• A.

A turbine

• B.

A transformer

• C.

A generator

• D.

A commulator

C. A generator
Explanation
A generator uses the motion in an electric field to produce an electric current. It does this by rotating a coil of wire within a magnetic field, which induces a current to flow in the wire. The motion of the coil in the electric field creates a changing magnetic field, which in turn generates an electric current through electromagnetic induction. This current can then be used to power electrical devices. A turbine, transformer, and commulator do not directly use motion in an electric field to produce an electric current, making them incorrect options.

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• 7.

### 7. The advantage of using alternating current is that it

• A.

Is safer.

• B.

Only requires one wire instead of two.

• C.

Can be easily raised or lowered to a higher or lower voltage.

• D.

Works better for transistors and computers.

C. Can be easily raised or lowered to a higher or lower voltage.
Explanation
Alternating current (AC) can be easily raised or lowered to a higher or lower voltage, which is a significant advantage. This feature allows for efficient transmission of electricity over long distances, as voltage can be stepped up for transmission and stepped down for distribution. It also enables the use of transformers to convert voltage levels according to specific requirements. This flexibility in voltage regulation makes AC a preferred choice for power distribution systems, as compared to direct current (DC) which requires complex conversion methods for voltage adjustment.

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• 8.

• A.

6V

• B.

12V

• C.

120V

• D.

2400V

C. 120V
Explanation
The voltage in a typical household is about 120V. This is the standard voltage used in most residential buildings in the United States. It is the voltage supplied by the electric utility companies and is considered safe for household appliances and electronics. Higher voltages, such as 2400V, are used for industrial or commercial purposes, while lower voltages, such as 6V or 12V, are typically used for low-power devices or batteries.

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• 9.

### 9. If an electric current reverses, the magnetic field produced by that current

• A.

Remains in the original direction.

• B.

Goes to and stays at zero.

• C.

Also reverses.

• D.

Is perpendicular to the original magnetic field direction.

C. Also reverses.
Explanation
When an electric current reverses, the magnetic field produced by that current also reverses. This is because the direction of the magnetic field is determined by the right-hand rule, which states that if you curl the fingers of your right hand in the direction of the current, your thumb will point in the direction of the magnetic field. So, when the current reverses, the direction in which you would curl your fingers also reverses, resulting in a reversal of the magnetic field.

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• 10.

### 10. A device that changes the voltage of alternating current is a

• A.

Transformer.

• B.

Motor.

• C.

Generator.

• D.

Galvanometer.

A. Transformer.
Explanation
A device that changes the voltage of alternating current is a transformer. A transformer works by using two coils of wire, known as the primary and secondary coils, that are wrapped around an iron core. When an alternating current passes through the primary coil, it creates a magnetic field in the iron core. This magnetic field then induces a voltage in the secondary coil, resulting in a change in the voltage level. Transformers are commonly used in power distribution systems to step up or step down voltages for transmission and use in different applications.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Apr 11, 2010
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